diff --git a/docs/API.md b/docs/API.md
index d3191b96a..e81553e3b 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -96,10 +96,27 @@ If available the ETag will also be part of JSON response objects as shown below
 
 # Changelog
 
-## 1.0.0 (unreleased)
+## API version 1.0
+
+- Deck >=1.0.0: The maximum length of the card title has been extended from 100 to 255 characters
+- Deck >=1.0.0: The API will now return a 400 Bad request response if the length limitation of a board, stack or card title is exceeded
+
+## API version 1.1
+
+This API version has become available with **Deck 1.3.0**.
 
 - The maximum length of the card title has been extended from 100 to 255 characters
 - The API will now return a 400 Bad request response if the length limitation of a board, stack or card title is exceeded
+- The attachments API endpoints will return other attachment types than deck_file
+  - Prior to Deck version v1.3.0 (API v1.0), attachments were stored within deck. For this type of attachments `deck_file` was used as the default type of attachments
+  - Starting with Deck version 1.3.0 (API v1.1) files are stored within the users regular Nextcloud files and the type `file` has been introduced for that
+
+## API version 1.2 (unreleased)
+
+- Endpoints for the new import functionality have been added:
+  - [GET /boards/import/getSystems - Import a board](#get-boardsimportgetsystems-import-a-board)
+  - [GET /boards/import/config/system/{schema} - Import a board](#get-boardsimportconfigsystemschema-import-a-board)
+  - [POST /boards/import - Import a board](#post-boardsimport-import-a-board)
 
 # Endpoints
 
@@ -927,7 +944,8 @@ The request can fail with a bad request response for the following reasons:
 | type      | String  | The type of the attachement                   |
 | file      | Binary  | File data to add as an attachment             |
 
-For now only `deck_file` is supported as an attachment type.
+- Prior to Deck version v1.3.0 (API v1.0), attachments were stored within deck. For this type of attachments `deck_file` was used as the default type of attachments
+- Starting with Deck version 1.3.0 (API v1.1) files are stored within the users regular Nextcloud files and the type `file` has been introduced for that
 
 #### Response