diff --git a/Doxyfile b/Doxyfile
index 954c17c487530517b57fd659eabd339623cf6adb..cd27491ecde771615d715387482be3dfb4451f85 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -844,7 +844,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = ./include/ ./docs/
+INPUT                  = ./include/ ./docs/ ./README.md
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
diff --git a/docs/dirs.dox b/docs/dirs.dox
new file mode 100644
index 0000000000000000000000000000000000000000..6aac0a8b764d70b2f51c7ac2e0280020e4d4812e
--- /dev/null
+++ b/docs/dirs.dox
@@ -0,0 +1,29 @@
+/// @dir include
+/// @brief Include directory. Add this to your include path.
+
+/// @dir include/mtxclient
+/// @brief The root directory for all the client callbacks.
+
+/// @dir include/mtxclient/http
+/// @brief Functions to invoke the API over HTTP.
+
+/// @dir include/mtxclient/crypto
+/// @brief Wrappers around the olm library as well as other encryption specific
+/// functionality.
+
+/// @dir include/mtx
+/// @brief The root directory for all the type definitions listed in the
+/// specifications.
+
+/// @dir include/mtx/events
+/// @brief The different event types in the Matrix API.
+
+/// @dir include/mtx/events/messages
+/// @brief The different types, that can be sent as a message event.
+
+/// @dir include/mtx/events/nheko_extensions
+/// @brief Nheko specific event types not part of the official specification.
+
+/// @dir include/mtx/responses
+/// @brief The reponses returned from each request.
+
diff --git a/docs/index.md b/docs/index.md
new file mode 100644
index 0000000000000000000000000000000000000000..0440fb521a6fcaa305cc89cc8eed805a0b1dfbdf
--- /dev/null
+++ b/docs/index.md
@@ -0,0 +1,21 @@
+mtxclient {#mainpage}
+=====================
+
+mtxclient is a library for the [Matrix protocol](https://matrix.org/) used
+primarily in the [Nheko client](https://nheko.im/nheko-reborn/nheko). This
+library is not a full SDK. Rather it is a thin wrapper providing functions and
+data structures to access the [Client-Server
+API](https://matrix.org/docs/spec/client_server/latest). Most of the semantics
+are described there and this library provides similarly named types and function
+to invoke those endpoints.
+
+mtxclient is built on top of
+[Boost.Asio](https://www.boost.org/doc/libs/1_75_0/doc/html/boost_asio.html) and
+[nlohmann/json](https://github.com/nlohmann/json). Many of the data structures
+in this library can be serialized to and deserialized from JSON. Most endpoints
+use a callback to inform the caller, if the request completed and what the
+response was.
+
+## Building
+
+For build instructions please refer to the [README](README.md).
diff --git a/include/mtx.hpp b/include/mtx.hpp
index 4a79c9714b50adefb745529eb585f16a0112a647..4eb600baa0c2d57f98c69857ec9424ed25d440e8 100644
--- a/include/mtx.hpp
+++ b/include/mtx.hpp
@@ -1,5 +1,9 @@
 #pragma once
 
+/// @file
+/// @brief A header including pretty much all the headers of the library.
+/// Including this will have a significant compile time cost.
+
 #include "mtx/identifiers.hpp"
 
 #include "mtx/events.hpp"
diff --git a/include/mtx/common.hpp b/include/mtx/common.hpp
index 31ca50934fa0a32fb39250cfec3dab6794537e0f..70629c427fcb80a5e731cf36a9fe5ad13edba584 100644
--- a/include/mtx/common.hpp
+++ b/include/mtx/common.hpp
@@ -10,7 +10,8 @@
 #include <string>
 #include <vector>
 
-//! Common types used by the crypto related endpoints.
+/// @file
+/// @brief Common types used by the crypto related endpoints.
 
 namespace mtx {
 namespace crypto {
diff --git a/include/mtx/errors.hpp b/include/mtx/errors.hpp
index 1dd8127f2e022031dc095dd23aa82a01c5fb7258..06e44be7931acd06324e4079cbdfabb7ae5cab7c 100644
--- a/include/mtx/errors.hpp
+++ b/include/mtx/errors.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief The error struct returned by the Matrix API.
+
 #include "lightweight_error.hpp"
 #include "user_interactive.hpp"
 
diff --git a/include/mtx/events.hpp b/include/mtx/events.hpp
index 36bb8384ed9c5053f9e4c179cb54df3f84bc5b83..b45b8a758b94737f62c97fca207bdbe3dbe04d8e 100644
--- a/include/mtx/events.hpp
+++ b/include/mtx/events.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Basetypes for events. Content is defined elsewhere.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/aliases.hpp b/include/mtx/events/aliases.hpp
index 64a68c4c302d908b29cba2bf005f28cc51364acb..cf07d17921acade9f9a675316c6643b368d7a3a9 100644
--- a/include/mtx/events/aliases.hpp
+++ b/include/mtx/events/aliases.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Alias events.
+
 #include <string>
 #include <vector>
 
diff --git a/include/mtx/events/avatar.hpp b/include/mtx/events/avatar.hpp
index 1a7c7e1a6b7547c5487b468453e705f11812813f..1c7fcdcc3409bb91c7110f9447f0cd64b375faa6 100644
--- a/include/mtx/events/avatar.hpp
+++ b/include/mtx/events/avatar.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Room avatar events.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/canonical_alias.hpp b/include/mtx/events/canonical_alias.hpp
index ed19abd558bd64753b8ff2d86395f59f986929a8..9005811895f6f825c650e42f231a9f41e3d61934 100644
--- a/include/mtx/events/canonical_alias.hpp
+++ b/include/mtx/events/canonical_alias.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Change the canonical or listed avatars of a room.
+
 #include <string>
 
 #if __has_include(<nlohmann/json_fwd.hpp>)
diff --git a/include/mtx/events/collections.hpp b/include/mtx/events/collections.hpp
index 5378f1af3b362372545bc48e416c1a047a520043..dcd0bc730880e1fb836ad57af8f9045aca0728d6 100644
--- a/include/mtx/events/collections.hpp
+++ b/include/mtx/events/collections.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Collections to store multiple events of different types
+
 #include <variant>
 
 #include "mtx/events.hpp"
@@ -141,6 +144,7 @@ using TimelineEvents = std::variant<events::StateEvent<states::Aliases>,
                                     events::RoomEvent<msgs::CallAnswer>,
                                     events::RoomEvent<msgs::CallHangUp>>;
 
+//! A wapper around TimelineEvent, that produces less noisy compiler errors.
 struct TimelineEvent
 {
         TimelineEvents data;
@@ -151,6 +155,7 @@ from_json(const json &obj, TimelineEvent &e);
 
 } // namespace collections
 
+//! Get the right event type for some type of message content.
 template<typename Content>
 constexpr inline EventType message_content_to_type = EventType::Unsupported;
 
@@ -195,6 +200,7 @@ template<>
 constexpr inline EventType message_content_to_type<mtx::events::msg::CallHangUp> =
   EventType::CallHangUp;
 
+//! Get the right event type for some type of state event content.
 template<typename Content>
 constexpr inline EventType state_content_to_type = EventType::Unsupported;
 
@@ -239,6 +245,7 @@ constexpr inline EventType state_content_to_type<mtx::events::state::Tombstone>
 template<>
 constexpr inline EventType state_content_to_type<mtx::events::state::Topic> = EventType::RoomTopic;
 
+//! Get the right event type for some type of device message content.
 template<typename Content>
 constexpr inline EventType to_device_content_to_type = EventType::Unsupported;
 
diff --git a/include/mtx/events/common.hpp b/include/mtx/events/common.hpp
index ea6cd4afa212f83f17f0059f488bb3d3ff6d8198..9da0c615acef8653f0781a25fdc49c3f5b6a8244 100644
--- a/include/mtx/events/common.hpp
+++ b/include/mtx/events/common.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Structs used in multiple different event types.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/create.hpp b/include/mtx/events/create.hpp
index 69cf3831fae7729439e5e5183c3eb7d4276de577..ff0422bfc425be9a96ae591d00eabc43bd3574b6 100644
--- a/include/mtx/events/create.hpp
+++ b/include/mtx/events/create.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief The first event in a room.
+
 #include <optional>
 
 #if __has_include(<nlohmann/json_fwd.hpp>)
@@ -11,7 +14,7 @@
 namespace mtx {
 namespace events {
 namespace state {
-
+//! The predecessor of this room.
 struct PreviousRoom
 {
         //! Required. The ID of the old room.
diff --git a/include/mtx/events/encrypted.hpp b/include/mtx/events/encrypted.hpp
index c6df7646165d633df3937a2798b6d65d598ace9d..246416908ef78ac23490248ddb31c69d03eda0e8 100644
--- a/include/mtx/events/encrypted.hpp
+++ b/include/mtx/events/encrypted.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Various event types used in E2EE.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/encryption.hpp b/include/mtx/events/encryption.hpp
index 42d0c8f1368a8266b61cc8f0b96f41ed8590b6b0..fbf8b0ee0bd88149f582be822bbf6658253dc047 100644
--- a/include/mtx/events/encryption.hpp
+++ b/include/mtx/events/encryption.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief The event enabling encryption in a room.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/event_type.hpp b/include/mtx/events/event_type.hpp
index 2a8fd4559cb2336e7a2728ec14346f051f0cda03..72945258359c5702c8c3df1730dcbc16ca0b01ff 100644
--- a/include/mtx/events/event_type.hpp
+++ b/include/mtx/events/event_type.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Enumeration of all event types
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -10,6 +13,7 @@
 namespace mtx {
 namespace events {
 
+//! The type of an event.
 enum class EventType
 {
         /// m.key.verification.cancel
@@ -100,12 +104,15 @@ enum class EventType
         Unsupported,
 };
 
+//! Turn an event into a string
 std::string
 to_string(EventType type);
 
+//! Parse a string into an event type.
 EventType
 getEventType(const std::string &type);
 
+//! Get the event type of an event.
 EventType
 getEventType(const nlohmann::json &obj);
 }
diff --git a/include/mtx/events/guest_access.hpp b/include/mtx/events/guest_access.hpp
index 2718f82431683c75d7bb4552fb1d79f4de464dbc..0effd617b4e24f33c968524ca795108397ab4df3 100644
--- a/include/mtx/events/guest_access.hpp
+++ b/include/mtx/events/guest_access.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief An event describing, if guest accounts can join a room.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -12,10 +15,11 @@ namespace mtx {
 namespace events {
 namespace state {
 
+//! The different access states for a room.
 enum class AccessState
 {
-        CanJoin,
-        Forbidden,
+        CanJoin,   //! Joining is allowd (for guests)
+        Forbidden, //! Guests can't join.
 };
 
 //! Converts @p AccessState to @p std::string for serialization.
diff --git a/include/mtx/events/history_visibility.hpp b/include/mtx/events/history_visibility.hpp
index ddc8cc4a5838c42685bbf6d0801f6d4762f655df..897df3f4c774a429ff8d4a0255b751bb6224d7ff 100644
--- a/include/mtx/events/history_visibility.hpp
+++ b/include/mtx/events/history_visibility.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief State event describing the visibility of the history.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -11,7 +14,7 @@
 namespace mtx {
 namespace events {
 namespace state {
-
+//! The different visibilities.
 enum class Visibility
 {
         //! All events while this is the `m.room.history_visibility`
diff --git a/include/mtx/events/join_rules.hpp b/include/mtx/events/join_rules.hpp
index 63473fd28197c1e95e7257cf8ce4465a429153af..989b1c038a6b83459f7b0ab0f502a1340d1e3bfa 100644
--- a/include/mtx/events/join_rules.hpp
+++ b/include/mtx/events/join_rules.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Manage the permission of how people can join a room.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -11,7 +14,7 @@
 namespace mtx {
 namespace events {
 namespace state {
-
+//! The different JoinRules
 enum class JoinRule
 {
         //! Anyone can join the room without any prior action.
diff --git a/include/mtx/events/member.hpp b/include/mtx/events/member.hpp
index 25fb66a9bf5423477f629ca59212294c9194aba2..d5e49950e1f4715e80602729b389fc7ac81d7c78 100644
--- a/include/mtx/events/member.hpp
+++ b/include/mtx/events/member.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief The state event describing the membership status of a specific member.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -11,7 +14,7 @@
 namespace mtx {
 namespace events {
 namespace state {
-
+//! The different Membership states.
 enum class Membership
 {
         //! The user has joined.
diff --git a/include/mtx/events/messages/audio.hpp b/include/mtx/events/messages/audio.hpp
index 912a3bd9bec4b7c480d26d0da02e5163413aa97b..0c7207cfbf424f89f879e6e68df28e2f39b740f1 100644
--- a/include/mtx/events/messages/audio.hpp
+++ b/include/mtx/events/messages/audio.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Audio messages.
+
 #include <optional>
 #include <string>
 
diff --git a/include/mtx/events/messages/emote.hpp b/include/mtx/events/messages/emote.hpp
index d86beccc7fc2494cf5effdbe61b35eb5e62ccc39..5ab5d2a5b527b2774ddafe9ff26348fa08778911 100644
--- a/include/mtx/events/messages/emote.hpp
+++ b/include/mtx/events/messages/emote.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Events describing an emotion or action.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/messages/file.hpp b/include/mtx/events/messages/file.hpp
index 8291615f37ffd6d49e984c790df364ba074f4a62..baa794fccd05ddcd9f2c983995c46603160ad541 100644
--- a/include/mtx/events/messages/file.hpp
+++ b/include/mtx/events/messages/file.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief A file sent in a room.
+
 #include <optional>
 #include <string>
 
diff --git a/include/mtx/events/messages/image.hpp b/include/mtx/events/messages/image.hpp
index 2f47dc423d0e65705b6b5f5bc742989673bfb322..8307da28d87cdd41c02c1f0909393da1e1ffe8b3 100644
--- a/include/mtx/events/messages/image.hpp
+++ b/include/mtx/events/messages/image.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Images sent in a room.
+
 #include <optional>
 #include <string>
 
diff --git a/include/mtx/events/messages/notice.hpp b/include/mtx/events/messages/notice.hpp
index 1de8878b2af38951f7a65aac6f4715cebd5b957d..b222f85e20ce444e0080af36fcdf52b635a3dead 100644
--- a/include/mtx/events/messages/notice.hpp
+++ b/include/mtx/events/messages/notice.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief A bot generated message and other notices.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/messages/text.hpp b/include/mtx/events/messages/text.hpp
index ab1d39da323495c14770c8bb4c8a97d53ed410b3..a64a749775710cb730718f2a8b67af3786a4152f 100644
--- a/include/mtx/events/messages/text.hpp
+++ b/include/mtx/events/messages/text.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief A text message.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/messages/video.hpp b/include/mtx/events/messages/video.hpp
index 8b361c105bbe99122dbda99abf5111c7eacdadb9..1b33bb8d36363ba46ca8c868645eedbffcee9a87 100644
--- a/include/mtx/events/messages/video.hpp
+++ b/include/mtx/events/messages/video.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief A video sent in a room.
+
 #include <optional>
 #include <string>
 
diff --git a/include/mtx/events/name.hpp b/include/mtx/events/name.hpp
index 4eb4d2243d7f305ab44b2806a53da638c2b13cf3..15c5ba80c98c5659d11661b1c19c4b1c575a4838 100644
--- a/include/mtx/events/name.hpp
+++ b/include/mtx/events/name.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief The room name state event.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/nheko_extensions/hidden_events.hpp b/include/mtx/events/nheko_extensions/hidden_events.hpp
index 7eb92578a505e03a821f218179ea24bd3ea8b92d..ba64d70e1778de4f095518efdead337d0a4b2843 100644
--- a/include/mtx/events/nheko_extensions/hidden_events.hpp
+++ b/include/mtx/events/nheko_extensions/hidden_events.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief A nheko specific event in account data used to hide events across different clients.
+
 #include <vector>
 
 #if __has_include(<nlohmann/json_fwd.hpp>)
@@ -13,6 +16,7 @@
 namespace mtx {
 namespace events {
 namespace account_data {
+//! Custom nheko specific event types
 namespace nheko_extensions {
 //! Custom event to hide certain event types in nheko
 struct HiddenEvents
diff --git a/include/mtx/events/pinned_events.hpp b/include/mtx/events/pinned_events.hpp
index c5e64606a08eb401d1eb3e4914d032e887e598bc..c404a1cbf24605ac4e0a404a7d014e3510039a29 100644
--- a/include/mtx/events/pinned_events.hpp
+++ b/include/mtx/events/pinned_events.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Events pinned in a room.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -12,8 +15,10 @@ namespace mtx {
 namespace events {
 namespace state {
 
+//! `m.room.pinned_events` state event.
 struct PinnedEvents
 {
+        //! The ids of the pinned events.
         std::vector<std::string> pinned;
 };
 
diff --git a/include/mtx/events/power_levels.hpp b/include/mtx/events/power_levels.hpp
index 375e67032304bd362208db3dc23eb79904d532ba..e4d0ed599fc53102f33100d3fe4b66226aecca4a 100644
--- a/include/mtx/events/power_levels.hpp
+++ b/include/mtx/events/power_levels.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief The state event governing the different permissions in a room.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -11,21 +14,28 @@
 namespace mtx {
 namespace events {
 namespace state {
+//! The type representing a power level.
 using power_level_t = int64_t;
 
+//! The default level required for events
 constexpr power_level_t EventsDefault = 0;
+//! The default level for users.
 constexpr power_level_t UsersDefault  = 0;
+//! The default level required for state events.
 constexpr power_level_t StatesDefault = 50;
 
+//! The power level usually associated with normal users.
 constexpr power_level_t User      = 0;
+//! The power level usually associated with moderators.
 constexpr power_level_t Moderator = 50;
+//! The power level usually associated with admins.
 constexpr power_level_t Admin     = 100;
 
-//! Content for the `m.room.power_levels` state event.
-//
-//! This event specifies the minimum level a user must have in
-//! order to perform a certain action. It also specifies the
-//! levels of each user in the room.
+/// @brief Content for the `m.room.power_levels` state event.
+///
+/// This event specifies the minimum level a user must have in
+/// order to perform a certain action. It also specifies the
+/// levels of each user in the room.
 struct PowerLevels
 {
         //! Returns the power_level for a given event type.
diff --git a/include/mtx/events/presence.hpp b/include/mtx/events/presence.hpp
index 34fbc191d365cbff3c90eea7f1bcf58d69266a79..17674a16fa842aea802fa773d538e28258631668 100644
--- a/include/mtx/events/presence.hpp
+++ b/include/mtx/events/presence.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief An ephemeral event describing the presence of a user.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -11,12 +14,14 @@
 #include <string_view>
 
 namespace mtx {
+//! Presence specific types.
 namespace presence {
+//! The current presence state.
 enum PresenceState
 {
-        online,
-        offline,
-        unavailable,
+        online,      //!< The user is online.
+        offline,     //!< The user is offline.
+        unavailable, //!< The user is online, but currently not available.
 };
 
 std::string
@@ -27,6 +32,7 @@ from_string(std::string_view str);
 
 namespace events {
 namespace presence {
+//! The `m.presence` ephemeral event.
 struct Presence
 {
         std::string avatar_url;  //! The current avatar URL for this user, if any.
diff --git a/include/mtx/events/reaction.hpp b/include/mtx/events/reaction.hpp
index 1ba22a1fc59ce598e59447808c8c32fb54031c3d..e8f8106f885f49a42e16586bffcdcc6533c3de4d 100644
--- a/include/mtx/events/reaction.hpp
+++ b/include/mtx/events/reaction.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief A reaction event used to attach small annotations to events.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/redaction.hpp b/include/mtx/events/redaction.hpp
index 0d4da0ca64bda750f0a3e24ca5b2e5598a8e9c54..6cda35c3b1846dd73138e1360ab077a283dd422f 100644
--- a/include/mtx/events/redaction.hpp
+++ b/include/mtx/events/redaction.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Events describing redactions and redacted content.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/tag.hpp b/include/mtx/events/tag.hpp
index 1eb78a02fde44ff8dfa06a4b68b7e21934e8b7ca..64f5c444ee3cc2f468e094b29fe9aa13f12dcd5d 100644
--- a/include/mtx/events/tag.hpp
+++ b/include/mtx/events/tag.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Events describing room tags.
+
 #include <optional>
 #include <string>
 
@@ -11,7 +14,9 @@
 
 namespace mtx {
 namespace events {
+//! Namespace for events in account_data
 namespace account_data {
+//! The content of a tag.
 struct Tag
 {
         //! A number in a range [0,1] describing a relative position of the room under
diff --git a/include/mtx/events/tombstone.hpp b/include/mtx/events/tombstone.hpp
index f5d3de25bdc74a0efe05b7bd96fe3b4705759801..84e3185b1371e9996258929c150f6759e30d3ceb 100644
--- a/include/mtx/events/tombstone.hpp
+++ b/include/mtx/events/tombstone.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief An event describing a room upgrade or shutdown.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/topic.hpp b/include/mtx/events/topic.hpp
index 8e4d69921a8cf3b11c213d682c7f815cd57343d3..befa8d7f97479d45e9a9c5b237953ea2643b2184 100644
--- a/include/mtx/events/topic.hpp
+++ b/include/mtx/events/topic.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief The state event describing the topic in a room.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/events/voip.hpp b/include/mtx/events/voip.hpp
index 7ed17936602a4ce4213a489ad560a2cb2ef76689..ee9dbe1453025e39a41ddd187016bd4a5559f7f1 100644
--- a/include/mtx/events/voip.hpp
+++ b/include/mtx/events/voip.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Call related events.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/identifiers.hpp b/include/mtx/identifiers.hpp
index b6ef59e576dd2d56055b2f4db7b0c666095708be..cf3c2d7c42d3cb8096a26a44707b68400bc7d08c 100644
--- a/include/mtx/identifiers.hpp
+++ b/include/mtx/identifiers.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Identifiers used in the Matrix API.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -33,6 +36,7 @@ protected:
         std::string id_;
 };
 
+//! An event id.
 class Event : public ID
 {
 public:
@@ -44,6 +48,7 @@ private:
         std::string sigil = "$";
 };
 
+//! A room id.
 class Room : public ID
 {
 public:
@@ -54,6 +59,7 @@ private:
         std::string sigil = "!";
 };
 
+//! A user id.
 class User : public ID
 {
 public:
@@ -110,9 +116,7 @@ void
 to_json(nlohmann::json &obj, const User &user);
 
 void
-from_json(const nlohmann::json &obj, Room &room)
-
-  ;
+from_json(const nlohmann::json &obj, Room &room);
 
 void
 to_json(nlohmann::json &obj, const Room &room);
diff --git a/include/mtx/lightweight_error.hpp b/include/mtx/lightweight_error.hpp
index dc207521ad3a5993098e32ccbf2aed39e3c5d072..01da796b1164a002dc6c21dd8d4ecbb0f46026b8 100644
--- a/include/mtx/lightweight_error.hpp
+++ b/include/mtx/lightweight_error.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Error codes returned by the Matrix API.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -8,8 +11,10 @@
 #include <string>
 
 namespace mtx {
+//! Namespace for Matrix errors.
 namespace errors {
 
+//! A Matrix error code.
 enum class ErrorCode
 {
         M_UNRECOGNIZED,
@@ -53,9 +58,11 @@ enum class ErrorCode
         M_INVALID_SIGNATURE,
 };
 
+//! Convert an error code into a string.
 std::string
 to_string(ErrorCode code);
 
+//! Parse an error code from a string.
 ErrorCode
 from_string(const std::string &code);
 
diff --git a/include/mtx/pushrules.hpp b/include/mtx/pushrules.hpp
index f4301d96be4dfbe84574ccb0a1c3a0dda33ad4d9..7b1ddfbd544c350b6bc2e0e1f6ff0f5dc8d6a260 100644
--- a/include/mtx/pushrules.hpp
+++ b/include/mtx/pushrules.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Pushrules and notification settings.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -11,7 +14,9 @@
 #include <vector>
 
 namespace mtx {
+//! Namespace for the pushrules specific endpoints.
 namespace pushrules {
+//! A condition to match pushrules on.
 struct PushCondition
 {
         //! Required. The kind of condition to apply. See conditions for more information on the
@@ -40,21 +45,34 @@ to_json(nlohmann::json &obj, const PushCondition &condition);
 void
 from_json(const nlohmann::json &obj, PushCondition &condition);
 
+//! Namespace for the different push actions.
 namespace actions {
+//! Notify the user.
 struct notify
 {};
+//! Don't notify the user.
 struct dont_notify
 {};
+/// @brief This enables notifications for matching events but activates homeserver specific
+/// behaviour to intelligently coalesce multiple events into a single notification.
+///
+/// Not all homeservers may support this. Those that do not support it should treat it as the notify
+/// action.
 struct coalesce
 {};
+//! Play a sound.
 struct set_tweak_sound
 {
+        //! The sound to play.
         std::string value = "default";
 };
+//! Highlight the message.
 struct set_tweak_highlight
 {
         bool value = true;
 };
+
+//! A collection for the different actions.
 using Action = std::variant<actions::notify,
                             actions::dont_notify,
                             actions::coalesce,
@@ -67,6 +85,7 @@ to_json(nlohmann::json &obj, const Action &action);
 void
 from_json(const nlohmann::json &obj, Action &action);
 
+//! A list of actions.
 struct Actions
 {
         std::vector<Action> actions;
@@ -78,6 +97,7 @@ void
 from_json(const nlohmann::json &obj, Actions &action);
 }
 
+//! A pushrule defining the notification behaviour for a message.
 struct PushRule
 {
         //! Required. Whether this is a default rule, or has been set explicitly.
@@ -102,6 +122,7 @@ to_json(nlohmann::json &obj, const PushRule &condition);
 void
 from_json(const nlohmann::json &obj, PushRule &condition);
 
+//! All the pushrules to evaluate for events.
 struct Ruleset
 {
         //! see https://matrix.org/docs/spec/client_server/latest#push-rules
@@ -126,8 +147,10 @@ to_json(nlohmann::json &obj, const Ruleset &condition);
 void
 from_json(const nlohmann::json &obj, Ruleset &condition);
 
+//! The global ruleset applied to all events.
 struct GlobalRuleset
 {
+        //! The actual ruleset.
         Ruleset global;
 };
 
@@ -137,6 +160,7 @@ to_json(nlohmann::json &obj, const GlobalRuleset &set);
 void
 from_json(const nlohmann::json &obj, GlobalRuleset &set);
 
+//! The response for queries, if a specific ruleset is enabled.
 struct Enabled
 {
         bool enabled = true;
diff --git a/include/mtx/requests.hpp b/include/mtx/requests.hpp
index eba9a85eedfec0bd25f822aaccbf7cb7fc29a390..320e9aac4e72d070f092d578c8d2cf570a8bf755 100644
--- a/include/mtx/requests.hpp
+++ b/include/mtx/requests.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Structs for for requests to the Matrix API.
+
 #include <string>
 #include <variant>
 
@@ -14,6 +17,7 @@
 using json = nlohmann::json;
 
 namespace mtx {
+//! Namespace for request structs
 namespace requests {
 
 //! Whether or not the room will be visible by non members.
diff --git a/include/mtx/responses.hpp b/include/mtx/responses.hpp
index 6f7d5578415ec82445eb282341efbb9436420c28..ebe6d00f375082210e7f67af34c060b13cf268ef 100644
--- a/include/mtx/responses.hpp
+++ b/include/mtx/responses.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Collection header for all the different response structs.
+
 #include "responses/common.hpp"
 
 #include "responses/create_room.hpp"
diff --git a/include/mtx/responses/common.hpp b/include/mtx/responses/common.hpp
index 574679157b94b11559cf4f7a73abad0507db7e7d..9458b3c1d7d4cea2435694c611bc273a3668f3de 100644
--- a/include/mtx/responses/common.hpp
+++ b/include/mtx/responses/common.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Responses used by multiple endpoints.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -12,46 +15,59 @@
 #include "mtx/events/collections.hpp"
 
 namespace mtx {
+//! Namespace for the different types of responses.
 namespace responses {
-
+//! An event id returned by the API.
 struct EventId
 {
+        //! The event id.
         mtx::identifiers::Event event_id;
 };
 
 void
 from_json(const nlohmann::json &obj, EventId &response);
 
+//! A group id returned by the API.
 struct GroupId
 {
+        //! The group id.
         std::string group_id;
 };
 
 void
 from_json(const nlohmann::json &obj, GroupId &response);
 
+//! A room id returned by the API.
 struct RoomId
 {
+        //! The room id.
         std::string room_id;
 };
 
 void
 from_json(const nlohmann::json &obj, RoomId &response);
 
+//! A filter id returned by the API.
 struct FilterId
 {
+        //! The filter id.
         std::string filter_id;
 };
 
 void
 from_json(const nlohmann::json &obj, FilterId &response);
 
+//! Different helper for parsing responses.
 namespace utils {
-
+//! Multiple account_data events.
 using RoomAccountDataEvents = std::vector<mtx::events::collections::RoomAccountDataEvents>;
+//! Multiple TimelineEvents.
 using TimelineEvents        = std::vector<mtx::events::collections::TimelineEvents>;
+//! Multiple StateEvents.
 using StateEvents           = std::vector<mtx::events::collections::StateEvents>;
+//! Multiple StrippedEvents.
 using StrippedEvents        = std::vector<mtx::events::collections::StrippedEvents>;
+//! Multiple DeviceEvents.
 using DeviceEvents          = std::vector<mtx::events::collections::DeviceEvents>;
 
 namespace states = mtx::events::state;
@@ -63,21 +79,26 @@ log_error(std::exception &err, const nlohmann::json &event);
 void
 log_error(std::string err, const nlohmann::json &event);
 
+//! Parse multiple account_data events.
 void
 parse_room_account_data_events(const nlohmann::json &events, RoomAccountDataEvents &container);
 
 void
 compose_timeline_events(nlohmann::json &events, const TimelineEvents &container);
 
+//! Parse multiple timeline events.
 void
 parse_timeline_events(const nlohmann::json &events, TimelineEvents &container);
 
+//! Parse multiple state events.
 void
 parse_state_events(const nlohmann::json &events, StateEvents &container);
 
+//! Parse multiple stripped events.
 void
 parse_stripped_events(const nlohmann::json &events, StrippedEvents &container);
 
+//! Parse multiple device events.
 void
 parse_device_events(const nlohmann::json &events, DeviceEvents &container);
 }
diff --git a/include/mtx/responses/create_room.hpp b/include/mtx/responses/create_room.hpp
index e1fe6e10d364103f23d0944188880c21a680264b..91ee521b131e15e9c0aa81383c1ed332132ee830 100644
--- a/include/mtx/responses/create_room.hpp
+++ b/include/mtx/responses/create_room.hpp
@@ -1,11 +1,16 @@
 #pragma once
 
+/// @file
+/// @brief Response from creating a room.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
 #include <nlohmann/json.hpp>
 #endif
 
+#include <mtx/identifiers.hpp>
+
 namespace mtx {
 namespace responses {
 //! Response from the `POST /_matrix/client/r0/createRoom` endpoint.
diff --git a/include/mtx/responses/crypto.hpp b/include/mtx/responses/crypto.hpp
index 358886bc64db82bf9ac6968ca01d8f617415f62c..1cf6ce46900917bad488a7cbae13846f1f5811f3 100644
--- a/include/mtx/responses/crypto.hpp
+++ b/include/mtx/responses/crypto.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief E2EE related endpoints.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -53,8 +56,10 @@ to_json(nlohmann::json &obj, const QueryKeys &response);
 void
 from_json(const nlohmann::json &obj, QueryKeys &response);
 
+//! Request for `POST /_matrix/client/r0/keys/upload`.
 struct KeySignaturesUpload
 {
+        //! Errors returned during upload.
         std::map<std::string, std::map<std::string, mtx::errors::LightweightError>> errors;
 };
 
@@ -89,6 +94,7 @@ struct KeyChanges
 void
 from_json(const nlohmann::json &obj, KeyChanges &response);
 
+//! KeysBackup related responses.
 namespace backup {
 //! Encrypted session data using the m.megolm_backup.v1.curve25519-aes-sha2 algorithm
 struct EncryptedSessionData
@@ -177,6 +183,7 @@ from_json(const nlohmann::json &obj, BackupVersion &response);
 void
 to_json(nlohmann::json &obj, const BackupVersion &response);
 
+//! The SessionData stored in the KeysBackup.
 struct SessionData
 {
         //! Required. The end-to-end message encryption algorithm that the key is
diff --git a/include/mtx/responses/empty.hpp b/include/mtx/responses/empty.hpp
index cf742761afa8f9143c67355e23963e366ee4f3c9..dc4ab9e4cc11dd9634cd5ea82b111bd1cf3fb0c6 100644
--- a/include/mtx/responses/empty.hpp
+++ b/include/mtx/responses/empty.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Empty responses returned by different endpoints.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/responses/groups.hpp b/include/mtx/responses/groups.hpp
index b7012ac0cb4c1ed6cd456f8eb39ab0502f77df61..dcd20ebcdf89b4d193a37949647b72065b3e5a9e 100644
--- a/include/mtx/responses/groups.hpp
+++ b/include/mtx/responses/groups.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Groups related endpoints.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -8,18 +11,22 @@
 
 namespace mtx {
 namespace responses {
-
+//! The list of joined groups.
 struct JoinedGroups
 {
+        //! joined group ids.
         std::vector<std::string> groups;
 };
 
 void
 from_json(const nlohmann::json &obj, JoinedGroups &res);
 
+//! The profile of a group.
 struct GroupProfile
 {
+        //! The group name.
         std::string name;
+        //! The group avatar.
         std::string avatar_url;
 };
 
diff --git a/include/mtx/responses/login.hpp b/include/mtx/responses/login.hpp
index e38f30e9e81761724ee18633816ed159f5570dad..ee243eabfa5f2768f41f12cacadb6edef4aca846 100644
--- a/include/mtx/responses/login.hpp
+++ b/include/mtx/responses/login.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Login related responses.
+
 #include <optional>
 #include <string>
 
@@ -37,8 +40,10 @@ struct Login
 void
 from_json(const nlohmann::json &obj, Login &response);
 
+//! One supported login flow.
 struct LoginFlow
 {
+        //! The authentication used for this flow.
         mtx::user_interactive::AuthType type;
 };
 void
@@ -47,6 +52,7 @@ from_json(const nlohmann::json &obj, LoginFlow &response);
 //! Response from the `GET /_matrix/client/r0/login` endpoint.
 struct LoginFlows
 {
+        //! The list of supported flows.
         std::vector<LoginFlow> flows;
 };
 
diff --git a/include/mtx/responses/media.hpp b/include/mtx/responses/media.hpp
index c40e7d0f889497ccbde31454e3543340fdd33f21..acc44695d65269943768d7046bd294a5ee32469e 100644
--- a/include/mtx/responses/media.hpp
+++ b/include/mtx/responses/media.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Responses returned by the media repo.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/responses/messages.hpp b/include/mtx/responses/messages.hpp
index 1bf7da48ebe0a9269324304228323fae0435fae1..e5de898fe4824111aaa9b1e1f661f49f3838979e 100644
--- a/include/mtx/responses/messages.hpp
+++ b/include/mtx/responses/messages.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Reponses from the message pagination API.
+
 #include <string>
 
 #if __has_include(<nlohmann/json_fwd.hpp>)
diff --git a/include/mtx/responses/notifications.hpp b/include/mtx/responses/notifications.hpp
index afefcab7cca2222c45291a0f2625062cfd3fb737..1f0974b9b1ef64e35f64455575e1b9ddacaab2b3 100644
--- a/include/mtx/responses/notifications.hpp
+++ b/include/mtx/responses/notifications.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Notification related endpoints.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -12,6 +15,7 @@
 namespace mtx {
 namespace responses {
 
+//! Description for a notification.
 struct Notification
 {
         //! The action to perform when the conditions for this rule are met.
diff --git a/include/mtx/responses/profile.hpp b/include/mtx/responses/profile.hpp
index d1a046b610576bd7aa7584ed9bf3bdc87363631a..a7781f689599a3b595c0baf4dbf518a8040ea7c4 100644
--- a/include/mtx/responses/profile.hpp
+++ b/include/mtx/responses/profile.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Responses from the profile API.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/responses/register.hpp b/include/mtx/responses/register.hpp
index 4a1c1654674643ed311cc4f02bf28b526bf5f4ea..3ae65b70305a253fbd43097d5e54c812e04d12f9 100644
--- a/include/mtx/responses/register.hpp
+++ b/include/mtx/responses/register.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Responses from the registration API.
+
 #include <string>
 
 #if __has_include(<nlohmann/json_fwd.hpp>)
diff --git a/include/mtx/responses/sync.hpp b/include/mtx/responses/sync.hpp
index 0c1f5fd3671dc48fc2c801cbed8f1c8af30dd4e7..f145913894945dbfa79e6037366198baa5d957c2 100644
--- a/include/mtx/responses/sync.hpp
+++ b/include/mtx/responses/sync.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Response from the /sync API.
+
 #include <map>
 #include <string>
 #include <vector>
diff --git a/include/mtx/responses/turn_server.hpp b/include/mtx/responses/turn_server.hpp
index c8fe103794fc76997ffac7cc9bc2c950bf7e5c44..5c4fa3d5e37b0782a9611f9a2234346823867f6b 100644
--- a/include/mtx/responses/turn_server.hpp
+++ b/include/mtx/responses/turn_server.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Responses for the turn server used for calls.
+
 #include <string>
 #include <vector>
 
diff --git a/include/mtx/responses/version.hpp b/include/mtx/responses/version.hpp
index 28b44f11bffd3b4676a1ead603ec9788bca5ab8a..23a2cb09f9aa1a3d7d9e089be38acf47034f75f1 100644
--- a/include/mtx/responses/version.hpp
+++ b/include/mtx/responses/version.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Return value of the server and API version query.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtx/responses/well-known.hpp b/include/mtx/responses/well-known.hpp
index 98c246aa6f412275ddcbd59f5f20615d02d19277..9e5a64aad2d71de92fcb0807c8013ac34506836e 100644
--- a/include/mtx/responses/well-known.hpp
+++ b/include/mtx/responses/well-known.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Response for .well-known lookup.
+
 #include <optional>
 
 #if __has_include(<nlohmann/json_fwd.hpp>)
@@ -10,6 +13,7 @@
 
 namespace mtx {
 namespace responses {
+//! The info about this server.
 struct ServerInformation
 {
         //! Required. The base URL for client-server connections.
diff --git a/include/mtx/secret_storage.hpp b/include/mtx/secret_storage.hpp
index f6b9ac845a39841276bbfa592d5c1f528aebd79e..15c0af0336a6a37c52d16b7b81307443f71dc041 100644
--- a/include/mtx/secret_storage.hpp
+++ b/include/mtx/secret_storage.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Header with SSSS related types.
+
 #include <cstdint>
 #include <map>
 #include <optional>
@@ -26,6 +29,7 @@ constexpr const char cross_signing_user_signing[] = "m.cross_signing.user_signin
 constexpr const char cross_signing_master[]       = "m.cross_signing.master";
 }
 
+//! A aes-hmac-sha2 encrypted secret.
 struct AesHmacSha2EncryptedData
 {
         std::string iv;         //!< Required. The 16-byte initialization vector, encoded as base64.
@@ -39,6 +43,7 @@ to_json(nlohmann::json &obj, const AesHmacSha2EncryptedData &data);
 void
 from_json(const nlohmann::json &obj, AesHmacSha2EncryptedData &data);
 
+//! A secret, encrypted with one or more algorithms.
 struct Secret
 {
         /// @brief Required. Map from key ID the encrypted data.
@@ -54,6 +59,7 @@ to_json(nlohmann::json &obj, const Secret &secret);
 void
 from_json(const nlohmann::json &obj, Secret &secret);
 
+//! Information about the key derivation from a passphrase.
 struct PBKDF2
 {
         //! Required. Must be m.pbkdf2
@@ -72,6 +78,7 @@ to_json(nlohmann::json &obj, const PBKDF2 &desc);
 void
 from_json(const nlohmann::json &obj, PBKDF2 &desc);
 
+//! Description of the key for a secret.
 struct AesHmacSha2KeyDescription
 {
         std::string name; //!< Required. The name of the key.
diff --git a/include/mtx/user_interactive.hpp b/include/mtx/user_interactive.hpp
index 90c36cc6b5b8061999a33be7f175a86b1f0f9177..90825c4bb269ac5a4ea8914b7864bce6716c9370 100644
--- a/include/mtx/user_interactive.hpp
+++ b/include/mtx/user_interactive.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Header with types for user interactive authentication
+
 #include <string>
 #include <string_view>
 #include <unordered_map>
@@ -13,61 +16,86 @@
 #endif
 
 namespace mtx {
+//! Types and definitions for user interactive authentication.
 namespace user_interactive {
+//! The type of the different auth types.
 using AuthType = std::string;
+//! The different auth types.
 namespace auth_types {
+//! Password based authentication.
 constexpr std::string_view password       = "m.login.password";
+//! Authentication using a ReCaptcha.
 constexpr std::string_view recaptcha      = "m.login.recaptcha";
+//! Authentication using oauth2.
 constexpr std::string_view oauth2         = "m.login.oauth2";
+//! Authentication via email.
 constexpr std::string_view email_identity = "m.login.email.identity";
+//! Authentication using SMS?
 constexpr std::string_view msisdn         = "m.login.msisdn";
+//! Token based auth.
 constexpr std::string_view token          = "m.login.token";
+//! Single Sign On.
 constexpr std::string_view sso            = "m.login.sso"; // needed for /login at least
+//! Placeholder used in alternative auth flows.
 constexpr std::string_view dummy          = "m.login.dummy";
+//! Authentication by accepting a set of terms like a privacy policy.
 constexpr std::string_view terms          = "m.login.terms"; // see MSC1692
 }
 
+//! A list of auth types
 using Stages = std::vector<AuthType>;
+//! A flow composed of a list of stages
 struct Flow
 {
+        //! The stages to complete.
         Stages stages;
 };
 void
 from_json(const nlohmann::json &obj, Flow &flow);
+
+//! Parameters for oauth2.
 struct OAuth2Params
 {
+        //! The oauth uri
         std::string uri;
 };
 void
 from_json(const nlohmann::json &obj, OAuth2Params &params);
 
+//! The desciption of one policy in the terms and conditions.
 struct PolicyDescription
 {
-        std::string name; // language specific name
-        std::string url;  // language specific link
+        std::string name; //!< language specific name
+        std::string url;  //!< language specific link
 };
 void
 from_json(const nlohmann::json &obj, PolicyDescription &desc);
 
+//! A policy in the terms and conditions.
 struct Policy
 {
+        //! Version of this policy
         std::string version;
-        // 2 letter language code to policy name and link, fallback to "en"
-        // recommended, when language not available.
+        /// @brief 2 letter language code to policy name and link, fallback to "en"
+        /// recommended, when language not available.
         std::unordered_map<std::string, PolicyDescription> langToPolicy;
 };
 void
 from_json(const nlohmann::json &obj, Policy &policy);
 
+//! Parameters for the auth stage requiring you to accept terms and conditions.
 struct TermsParams
 {
+        //! The different policies by name.
         std::unordered_map<std::string, Policy> policies;
 };
 void
 from_json(const nlohmann::json &obj, TermsParams &params);
 
+//! All the different parameters.
 using Params = std::variant<OAuth2Params, TermsParams, std::string>;
 
+//! The struct returned on requests failing with 401.
 struct Unauthorized
 {
         // completed stages
@@ -85,16 +113,21 @@ struct Unauthorized
 void
 from_json(const nlohmann::json &obj, Unauthorized &unauthorized);
 
+//! namespace for the request types in the different auth stages.
 namespace auth {
+//! Password stage
 struct Password
 {
+        //! The password set by the user.
         std::string password;
 
+        //! Types of identifiers.
         enum IdType
         {
-                UserId,
-                ThirdPartyId
+                UserId,      //!< Use the identifier_user
+                ThirdPartyId //!< use identifier_medium and identifier_address
         };
+        //! If a user or third party identifier is used.
         IdType identifier_type;
 
         //! for user
@@ -105,12 +138,14 @@ struct Password
         std::string identifier_address;
 };
 
+//! ReCaptcha stage.
 struct ReCaptcha
 {
         //! The recaptcha response
         std::string response;
 };
 
+//! Token stage.
 struct Token
 {
         //! the obtained token
@@ -119,6 +154,7 @@ struct Token
         std::string txn_id;
 };
 
+//! Third party identifier for Email or MSISDN stages
 struct ThreePIDCred
 {
         //! identity server session id
@@ -130,11 +166,15 @@ struct ThreePIDCred
         //! access token previously registered with the identity server
         std::string id_access_token;
 };
+
+//! Email authentication stage.
 struct EmailIdentity
 {
         // The 3rd party ids
         std::vector<ThreePIDCred> threepidCreds;
 };
+
+//! SMS authentication stage.
 struct MSISDN
 {
         // The 3rd party ids
@@ -144,15 +184,21 @@ struct MSISDN
 //! OAuth2, client retries with the session only, so I'm guessing this is empty?
 struct OAuth2
 {};
+//! Empty struct, when parameters are accepted.
 struct Terms
 {};
+//! Empty struct to complete SSO.
 struct SSO
 {};
+//! Empty struct to complete dummy auth.
 struct Dummy
 {};
+//! Fallback auth.
 struct Fallback
 {};
 }
+
+//! The auth request to complete a stage.
 struct Auth
 {
         //! the session id
diff --git a/include/mtxclient/crypto/client.hpp b/include/mtxclient/crypto/client.hpp
index b6894071a4bc4eedb6c5bea5f2c96f479446fedb..bd60ee7d8da934b01863fe2f3563b61c2f3eb89f 100644
--- a/include/mtxclient/crypto/client.hpp
+++ b/include/mtxclient/crypto/client.hpp
@@ -1,5 +1,9 @@
 #pragma once
 
+/// @file
+/// @brief Holds most of the crypto functions and errors as well as a Client, which does the Olm
+/// account bookkeeping for you.
+
 #include <exception>
 #include <memory>
 #include <new>
@@ -105,20 +109,36 @@ unpickle(const std::string &pickled, const std::string &key)
         return object;
 }
 
+//! Return value from decrypting a group message.
 struct GroupPlaintext
 {
+        //! The plain text, which was decrypted.
         BinaryBuf data;
+        //! The message index used for this message.
         uint32_t message_index;
 };
 
 //! Helper to generate Short Authentication Strings (SAS)
 struct SAS
 {
+        //! Create a new SAS object.
         SAS();
+        //! Query the public key generated for this object.
         std::string public_key();
+        //! Set the key of the other party being verified.
         void set_their_key(std::string their_public_key);
+        /// @brief Returns 3 integers ranging from 1000 to 9191, to be used only after
+        /// using `set_their_key`
+        ///
+        /// These are meant to be compared by the users verifying each other.
         std::vector<int> generate_bytes_decimal(std::string info);
+        /// @brief Returns 7 integers in the range from 0 to 63, to be used only after using
+        /// `set_their_key`
+        ///
+        /// Map these numpers to one of the 64 emoji from the specification and let the user compare
+        /// them.
         std::vector<int> generate_bytes_emoji(std::string info);
+        //! Calculate MACs after verification to verify keys.
         std::string calculate_mac(std::string input_data, std::string info);
 
 private:
@@ -147,15 +167,20 @@ class OlmClient : public std::enable_shared_from_this<OlmClient>
 {
 public:
         OlmClient() = default;
+        //! Initialize a crypto client for the specified device of the specified user.
         OlmClient(std::string user_id, std::string device_id)
           : user_id_(std::move(user_id))
           , device_id_(std::move(device_id))
         {}
 
+        //! Base64 encoded string
         using Base64String      = std::string;
+        //! A signed set of one time keys indexed by `<algorithm>:<key_id>`.
         using SignedOneTimeKeys = std::map<std::string, requests::SignedOneTimeKey>;
 
+        //! Set the id of this device.
         void set_device_id(std::string device_id) { device_id_ = std::move(device_id); }
+        //! Set the id of this user.
         void set_user_id(std::string user_id) { user_id_ = std::move(user_id); }
 
         //! Sign the given message.
@@ -163,8 +188,11 @@ public:
 
         //! Create a new olm Account. Must be called before any other operation.
         void create_new_account();
+        //! Create a new olm utility object.
         void create_new_utility() { utility_ = create_olm_object<UtilityObject>(); }
 
+        /// @brief Restore the olm account from a pickled string encrypted by `key`
+        /// @see load
         void restore_account(const std::string &saved_data, const std::string &key);
 
         //! Retrieve the json representation of the identity keys for the given account.
@@ -190,6 +218,7 @@ public:
 
         //! Prepare request for the /keys/upload endpoint by signing identity & one time keys.
         mtx::requests::UploadKeys create_upload_keys_request(const OneTimeKeys &keys);
+        //! Prepare an empty /keys/upload request.
         mtx::requests::UploadKeys create_upload_keys_request();
 
         //! Decrypt a message using megolm.
@@ -206,17 +235,40 @@ public:
                                   std::size_t msg_type,
                                   const std::string &msg);
 
-        //! Create an outbount megolm session.
+        /// @brief Create an outbound megolm session.
+        /// @sa init_inbound_group_session(const std::string&), import_inbound_group_session()
         OutboundGroupSessionPtr init_outbound_group_session();
+        /// @brief Initialize an inbound group session from a shared session key (an m.room_key
+        /// event).
+        /// @sa init_inbound_group_session(), import_inbound_group_session()
         InboundGroupSessionPtr init_inbound_group_session(const std::string &session_key);
+        /// @brief Initialize an inbound group session from a forwarded session key (an
+        /// m.forwarded_room_key event).
+        /// @sa init_inbound_group_session(const std::string&), init_inbound_group_session()
         InboundGroupSessionPtr import_inbound_group_session(const std::string &session_key);
+
+        /// @brief create an outbound session to encrypt to device messages.
+        /// @param identity_key The curve25519 key of the other party.
+        /// @param one_time_key The claimed one time key of the other party.
         OlmSessionPtr create_outbound_session(const std::string &identity_key,
                                               const std::string &one_time_key);
+        /// @brief Creates an inbound session from an inbound message. DON'T USE THIS, use
+        /// create_inbound_session_from() instead.
+        /// @sa create_inbound_session_from()
         OlmSessionPtr create_inbound_session(const BinaryBuf &one_time_key_message);
+        /// @brief Creates an inbound session from an inbound message. DON'T USE THIS, use
+        /// create_inbound_session_from() instead.
+        /// @sa create_inbound_session_from()
         OlmSessionPtr create_inbound_session(const std::string &one_time_key_message);
 
+        /// @brief Create an inbound olm session from the other users message and identity key
+        /// @sa create_inbound_session_from(const std::string&, const std::string&),
+        /// create_outbound_session(), create_inbound_session()
         OlmSessionPtr create_inbound_session_from(const std::string &their_curve25519,
                                                   const BinaryBuf &one_time_key_message);
+        /// @brief Create an inbound olm session from the other users message and identity key
+        /// @sa create_inbound_session_from(const std::string&, const BinaryBuf&),
+        /// create_outbound_session(), create_inbound_session()
         OlmSessionPtr create_inbound_session_from(const std::string &their_curve25519,
                                                   const std::string &one_time_key_message);
 
@@ -228,13 +280,18 @@ public:
                                                     const std::string &recipient_ed25519_key,
                                                     const std::string &recipient_curve25519_key);
 
+        //! store the account in a pickled string encrypted by `key`
         std::string save(const std::string &key);
+        /// @brief Restore the account from a pickled string encrypted by `key`
+        /// @see restore_account
         void load(const std::string &data, const std::string &key)
         {
                 account_ = unpickle<AccountObject>(data, key);
         }
 
+        //! Access the olm account directly.
         OlmAccount *account() { return account_.get(); }
+        //! Access the olm utility object directly.
         OlmUtility *utility() { return utility_.get(); }
 
         //! SAS related stuff
@@ -269,17 +326,23 @@ export_session(OlmInboundGroupSession *s);
 InboundGroupSessionPtr
 import_session(const std::string &session_key);
 
+/// Checks if an inbound session matches a pre key message.
+///
+/// Use matches_inbound_session_from() instead.
 bool
 matches_inbound_session(OlmSession *session, const std::string &one_time_key_message);
 
+//! Checks if an inbound session matches a pre key message
 bool
 matches_inbound_session_from(OlmSession *session,
                              const std::string &id_key,
                              const std::string &one_time_key_message);
 
+//! Encrypt the exported sessions according to the export format from the spec.
 std::string
 encrypt_exported_sessions(const mtx::crypto::ExportedSessionKeys &keys, std::string pass);
 
+//! Decrypt the exported sessions according to the export format from the spec.
 mtx::crypto::ExportedSessionKeys
 decrypt_exported_sessions(const std::string &data, std::string pass);
 
diff --git a/include/mtxclient/crypto/objects.hpp b/include/mtxclient/crypto/objects.hpp
index 9303940dfc333ef626242bf122b9e0d6ce4bd4f9..faf1a22cdb3deda772829098e680f7c1b778a581 100644
--- a/include/mtxclient/crypto/objects.hpp
+++ b/include/mtxclient/crypto/objects.hpp
@@ -1,5 +1,10 @@
 #pragma once
 
+/// @file
+/// @brief Wrappers around the various Olm types.
+///
+/// The wrappers implement RAII semantics, so you don't need to free stuff manually.
+
 #include <memory>
 #include <olm/olm.h>
 #include <olm/pk.h>
@@ -8,6 +13,19 @@
 namespace mtx {
 namespace crypto {
 
+/// @brief Deleter type to pass as a template argument to most smart pointers.
+///
+/// Can be used like so:
+///
+/// ```{.cpp}
+/// std::unique_ptr<OlmAccount, OlmDeleter> olmAccount = new uint8_t[olm_account_size()];
+/// ```
+///
+/// In general the coresponding *Object type should be preffered as a wapper, for example:
+///
+/// ```{.cpp}
+/// SASPtr sas = create_olm_object<SASObject>();
+/// ```
 struct OlmDeleter
 {
         void operator()(OlmAccount *ptr) { delete[](reinterpret_cast<uint8_t *>(ptr)); }
@@ -25,6 +43,7 @@ struct OlmDeleter
         void operator()(OlmSAS *ptr) { delete[](reinterpret_cast<uint8_t *>(ptr)); }
 };
 
+//! Olm type for Short Authentication Strings.
 struct SASObject
 {
         using olm_type = OlmSAS;
@@ -32,6 +51,7 @@ struct SASObject
         static olm_type *allocate() { return olm_sas(new uint8_t[olm_sas_size()]); }
 };
 
+//! Wrapper for the Olm utility object.
 struct UtilityObject
 {
         using olm_type = OlmUtility;
@@ -39,6 +59,7 @@ struct UtilityObject
         static olm_type *allocate() { return olm_utility(new uint8_t[olm_utility_size()]); }
 };
 
+//! Wrapper for the olm object to do Private Key Decryption.
 struct PkDecryptionObject
 {
         using olm_type = OlmPkDecryption;
@@ -49,6 +70,7 @@ struct PkDecryptionObject
         }
 };
 
+//! Wrapper for the olm object to do Private Key Signing.
 struct PkSigningObject
 {
         using olm_type = OlmPkSigning;
@@ -56,6 +78,7 @@ struct PkSigningObject
         static olm_type *allocate() { return olm_pk_signing(new uint8_t[olm_pk_signing_size()]); }
 };
 
+//! Wrapper for the olm account object.
 struct AccountObject
 {
         using olm_type = OlmAccount;
@@ -86,6 +109,7 @@ struct AccountObject
         }
 };
 
+//! Wrapper around olm sessions used for to device encryption.
 struct SessionObject
 {
         using olm_type = OlmSession;
@@ -116,6 +140,8 @@ struct SessionObject
         }
 };
 
+//! Wrapper around the olm object for inbound group sessions used to decrypt messages in matrix
+//! rooms.
 struct InboundSessionObject
 {
         using olm_type = OlmInboundGroupSession;
@@ -151,6 +177,8 @@ struct InboundSessionObject
         }
 };
 
+//! Wrapper around the outbound olm session object used to encrypt outbound group messages in matrix
+//! rooms.
 struct OutboundSessionObject
 {
         using olm_type = OlmOutboundGroupSession;
@@ -186,6 +214,7 @@ struct OutboundSessionObject
         }
 };
 
+//! Allocates an olm object using the mtxclient wrapper type.
 template<class T>
 std::unique_ptr<typename T::olm_type, OlmDeleter>
 create_olm_object()
diff --git a/include/mtxclient/crypto/types.hpp b/include/mtxclient/crypto/types.hpp
index 455b98dfb4be8db3e375d085808557a6692a47cd..b4cdc3cff6bc7e8bc787488d3205f204d4b13a40 100644
--- a/include/mtxclient/crypto/types.hpp
+++ b/include/mtxclient/crypto/types.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Various type definitions for the crypto API.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
@@ -8,40 +11,61 @@
 
 namespace mtx {
 namespace crypto {
-
+//! Constant for ed25519 keys
 constexpr auto ED25519           = "ed25519";
+//! Constant for curve25519 keys
 constexpr auto CURVE25519        = "curve25519";
+//! Constant for signed curve25519 keys
 constexpr auto SIGNED_CURVE25519 = "signed_curve25519";
+//! The algorithm used for group messages.
 constexpr auto MEGOLM_ALGO       = "m.megolm.v1.aes-sha2";
 
+//! An exported megolm group session
 struct ExportedSession
 {
-        std::map<std::string, std::string> sender_claimed_keys;   // currently unused.
+        //! Required. The Ed25519 key of the device which initiated the session originally.
+        std::map<std::string, std::string> sender_claimed_keys; // currently unused.
+        //! Required. Chain of Curve25519 keys through which this session was forwarded, via
+        //! m.forwarded_room_key events.
         std::vector<std::string> forwarding_curve25519_key_chain; // currently unused.
 
+        //! Required. The encryption algorithm that the session uses. Must be m.megolm.v1.aes-sha2.
         std::string algorithm = MEGOLM_ALGO;
+        //! Required. The room where the session is used.
         std::string room_id;
+        //! Required. The Curve25519 key of the device which initiated the session originally.
         std::string sender_key;
+        //! Required. The ID of the session.
         std::string session_id;
+        //! Required. The key for the session.
         std::string session_key;
 };
 
+//! A list of exported sessions.
 struct ExportedSessionKeys
 {
+        //! The actual sessions.
         std::vector<ExportedSession> sessions;
 };
 
+//! A pair of keys connected to an olm account.
 struct IdentityKeys
 {
+        //! The identity key.
         std::string curve25519;
+        //! The signing key.
         std::string ed25519;
 };
 
+//! A list of one time keys.
 struct OneTimeKeys
 {
+        //! The key id type.
         using KeyId      = std::string;
+        //! The type for the keys.
         using EncodedKey = std::string;
 
+        //! The one time keys by key id.
         std::map<KeyId, EncodedKey> curve25519;
 };
 
diff --git a/include/mtxclient/crypto/utils.hpp b/include/mtxclient/crypto/utils.hpp
index 61573a42c19d8ccfb68e876a0eb8adb716b8dc47..ffb4c490ed48669308904e81d83d97cbd78b0f00 100644
--- a/include/mtxclient/crypto/utils.hpp
+++ b/include/mtxclient/crypto/utils.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Various crypto functions.
+
 #include <string>
 #include <vector>
 
@@ -25,7 +28,7 @@ private:
         std::string msg_;
 };
 
-//! Data representation used to interact with libolm.
+//! Data representation used to interact with libolm. It's a contiguous buffer of bytes.
 using BinaryBuf = std::vector<uint8_t>;
 
 const std::string HEADER_LINE("-----BEGIN MEGOLM SESSION DATA-----");
@@ -35,6 +38,7 @@ const std::string TRAILER_LINE("-----END MEGOLM SESSION DATA-----");
 BinaryBuf
 create_buffer(std::size_t nbytes);
 
+//! Convert a string to a binary buffer.
 inline BinaryBuf
 to_binary_buf(const std::string &str)
 {
@@ -42,6 +46,7 @@ to_binary_buf(const std::string &str)
                          reinterpret_cast<const uint8_t *>(str.data()) + str.size());
 }
 
+//! Convert a binary buffer to a string.
 inline std::string
 to_string(const BinaryBuf &buf)
 {
@@ -55,14 +60,18 @@ PBKDF2_HMAC_SHA_512(const std::string pass,
                     uint32_t iterations,
                     uint32_t keylen = 64);
 
+//! Derive the SSSS decryption key from a passphrase using the parameters stored in account_data.
 std::optional<BinaryBuf>
 key_from_passphrase(const std::string &password,
                     const mtx::secret_storage::AesHmacSha2KeyDescription &parameters);
 
+//! Derive the SSSS decryption key from a base58 encoded recoverykey using the parameters stored in
+//! account_data.
 std::optional<BinaryBuf>
 key_from_recoverykey(const std::string &recoverkey,
                      const mtx::secret_storage::AesHmacSha2KeyDescription &parameters);
 
+//! Decrypt a secret from SSSS
 std::string
 decrypt(const mtx::secret_storage::AesHmacSha2EncryptedData &data,
         BinaryBuf decryptionKey,
@@ -89,6 +98,7 @@ CURVE25519_AES_SHA2_Decrypt(std::string base64_ciphertext,
                             const std::string &ephemeral,
                             const std::string &mac);
 
+//! Decrypt a session retrieved from online key backup.
 mtx::responses::backup::SessionData
 decrypt_session(const mtx::responses::backup::EncryptedSessionData &data,
                 const BinaryBuf &privateKey);
@@ -96,6 +106,7 @@ decrypt_session(const mtx::responses::backup::EncryptedSessionData &data,
 BinaryBuf
 HMAC_SHA256(const BinaryBuf hmacKey, const BinaryBuf data);
 
+//! Sha256 a string.
 std::string
 sha256(const std::string &data);
 
@@ -126,27 +137,35 @@ uint32_to_uint8(uint8_t b[4], uint32_t u32);
 void
 print_binary_buf(const BinaryBuf buf);
 
+//! Convert base64 to binary
 std::string
 base642bin(const std::string &b64);
 
+//! Encode a binary string in base64.
 std::string
 bin2base64(const std::string &bin);
 
+//! Decode unpadded base64 to binary.
 std::string
 base642bin_unpadded(const std::string &b64);
 
+//! Encode binary in unpadded base64.
 std::string
 bin2base64_unpadded(const std::string &bin);
 
+//! Decode urlsafe, unpadded base64 to binary.
 std::string
 base642bin_urlsafe_unpadded(const std::string &b64);
 
+//! Encode binary in urlsafe, unpadded base64.
 std::string
 bin2base64_urlsafe_unpadded(const std::string &bin);
 
+//! Encode binary in base58.
 std::string
 bin2base58(const std::string &bin);
 
+//! Decode base58 to binary.
 std::string
 base582bin(const std::string &bin);
 } // namespace crypto
diff --git a/include/mtxclient/http/client.hpp b/include/mtxclient/http/client.hpp
index 7ca1358732a744aa43a2941008288f7bcfe484d2..381facfd80cff4a44a5bfa728b2bba7a5299eb6d 100644
--- a/include/mtxclient/http/client.hpp
+++ b/include/mtxclient/http/client.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Primary header to access the http API.
+
 #if __has_include(<nlohmann/json_fwd.hpp>)
 #include <nlohmann/json_fwd.hpp>
 #else
diff --git a/include/mtxclient/http/client_impl.hpp b/include/mtxclient/http/client_impl.hpp
index 4051880a4360c4d0284a10d0e88ed6e32ae552d5..eb2156fcaca08411fa107c59fc61d3077e822723 100644
--- a/include/mtxclient/http/client_impl.hpp
+++ b/include/mtxclient/http/client_impl.hpp
@@ -1,13 +1,24 @@
 #pragma once
 
+/// @file
+/// @brief All the template stuff needed for the http client.
+///
+/// If you implement custom event types, this can be useful, but in general including this header
+/// just adds compile time without any benefits.
+
 #include "client.hpp"
 #include "mtxclient/utils.hpp" // for random_token, url_encode, des...
 
 #include <nlohmann/json.hpp>
 
 namespace mtx {
+//! A few helpers for the http client.
 namespace client {
 namespace utils {
+
+/// @brief deserialize a type or string from json.
+///
+/// Used internally to deserialize the response types for the various http methods.
 template<class T>
 inline T
 deserialize(const std::string &data)
@@ -22,6 +33,9 @@ deserialize<std::string>(const std::string &data)
         return data;
 }
 
+/// @brief serialize a type or string to json.
+///
+/// Used internally to serialize the request types for the various http methods.
 template<class T>
 inline std::string
 serialize(const T &obj)
diff --git a/include/mtxclient/http/errors.hpp b/include/mtxclient/http/errors.hpp
index aeb9ed2bf80210b2de2af18092dbd5cc307b56c8..853de39f98a4f610604d3bc4041ec58f351f217d 100644
--- a/include/mtxclient/http/errors.hpp
+++ b/include/mtxclient/http/errors.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Error codes returned by the client-server API
+
 #include "mtx/errors.hpp"
 #include <boost/beast/http/status.hpp>
 #include <boost/system/error_code.hpp>
diff --git a/include/mtxclient/http/session.hpp b/include/mtxclient/http/session.hpp
index 928de06b97d34ee646e9cbe59d8fb842f29470ab..0d90362fffebf5513bfafaaf13625102f04280d0 100644
--- a/include/mtxclient/http/session.hpp
+++ b/include/mtxclient/http/session.hpp
@@ -1,5 +1,10 @@
 #pragma once
 
+/// @file
+/// @brief A single http session, which is the context for a single http request.
+///
+/// You usually don't need to include this as session handling is handled by the library for you.
+
 #include <boost/asio.hpp>
 #include <boost/asio/ssl.hpp>
 #include <boost/beast.hpp>
diff --git a/include/mtxclient/utils.hpp b/include/mtxclient/utils.hpp
index ee98310b11f29f8574e1ca70a259d22000e0dc05..00ddf99bf3d6cf3a5e8c15c3d860a7ae0a72681c 100644
--- a/include/mtxclient/utils.hpp
+++ b/include/mtxclient/utils.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+/// @file
+/// @brief Various utility functions for http requests.
+
 #include <boost/iostreams/device/array.hpp>
 #include <iosfwd>
 #include <map>
@@ -7,6 +10,7 @@
 
 namespace mtx {
 namespace client {
+//! Utility namespace.
 namespace utils {
 
 //! Representation of Matrix Content (MXC) URIs.
diff --git a/lib/crypto/client.cpp b/lib/crypto/client.cpp
index f75a6e54774d39ad8633dc9a2439b9f1b9482056..b64e7517d5c3d9bad70fcc6bda5b69bd0bc3332e 100644
--- a/lib/crypto/client.cpp
+++ b/lib/crypto/client.cpp
@@ -419,7 +419,6 @@ SAS::SAS()
                 throw olm_exception("create_sas_instance", this->sas.get());
 }
 
-//! returns the public key of the key-pair created
 std::string
 SAS::public_key()
 {
@@ -434,7 +433,6 @@ SAS::public_key()
         return to_string(pub_key_buffer);
 }
 
-//! this is for setting the public key of the other user
 void
 SAS::set_their_key(std::string their_public_key)
 {
@@ -447,8 +445,6 @@ SAS::set_their_key(std::string their_public_key)
                 throw olm_exception("get_public_key", this->sas.get());
 }
 
-//! generates and returns a vector of numbers(int) ranging from 0 to 8191, to be used only after
-//! using `set_their_key`
 std::vector<int>
 SAS::generate_bytes_decimal(std::string info)
 {