diff --git a/docs/development/API/differences_in_mastoapi_responses.md b/docs/development/API/differences_in_mastoapi_responses.md
index 0cdab82094..6be9fc5ebf 100644
--- a/docs/development/API/differences_in_mastoapi_responses.md
+++ b/docs/development/API/differences_in_mastoapi_responses.md
@@ -40,11 +40,39 @@ Has these additional fields under the `pleroma` object:
 - `parent_visible`: If the parent of this post is visible to the user or not.
 - `pinned_at`: a datetime (iso8601) when status was pinned, `null` otherwise.
 - `quotes_count`: the count of status quotes.
+- `event`: event information if the post is an event, `null` otherwise.
 
 The `GET /api/v1/statuses/:id/source` endpoint additionally has the following attributes:
 
 - `content_type`: The content type of the status source.
 
+### Event
+
+Event object includes following fields:
+
+- `name`: event name.
+- `start_time`: datetime, if specified, the time when the event starts, `null` otherwise.
+- `end_time`: datetime, if specified, the time when the event finishes, `null` otherwise.
+- `join_mode`: who can join the event. Possible values, if specified: `free`, `restricted` and `invite`. `null` otherwise.
+- `participants_count`: the number of users who joined the event.
+- `location`: event location, if specified, `null` otherwise.
+- `join_state`: whether the user joined the event. Possible values: `pending`, `reject`, `accept`. `null`, if no `Join` exists.
+- `participation_request_count`: the number of users who requested to join the event.
+
+### Event location
+
+Event location object includes following fields:
+
+- `name`: place name.
+- `url`: location url address or `null`.
+- `longitude`: X-coordinate of the place or `null`. 
+- `latitude`: Y-coordinate of the place or `null`. 
+- `street`: place street or `null`.
+- `postal_code`: place postal code or `null`.
+- `locality`: place city or `null`.
+- `region`: place region or `null`.
+- `country`: place country or `null`.
+
 ## Scheduled statuses
 
 Has these additional fields in `params`:
@@ -163,6 +191,32 @@ The `type` value is `pleroma:emoji_reaction`. Has these fields:
 - `account`: The account of the user who reacted
 - `status`: The status that was reacted on
 
+### EventReminder Notification
+
+The `type` value is `pleroma:event_reminder`. Has these fields:
+
+- `status`: The event status
+
+### EventUpdate Notification
+
+The `type` value is `pleroma:event_update`. Has these fields:
+
+- `status`: The event status
+
+### ParticipationAccepted Notification
+
+The `type` value is `pleroma:participation_accepted`. Has these fields:
+
+- `status`: The event status
+- `participation_message`: Participation request message
+
+### ParticipationRequest Notification
+
+The `type` value is `pleroma:participation_request`. Has these fields:
+
+- `status`: The event status
+- `participation_message`: Participation request message
+
 ### ChatMention Notification (not default)
 
 This notification has to be requested explicitly.