diff --git a/docs/API.md b/docs/API.md
index 9e79ed2de..25b3f210a 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -84,6 +84,21 @@ curl -H "Authorization: Bearer put-your-access-token-here" -H "Accept: applicati
 # ...
 ```
 
+## File Uploads
+
+Some endpoints accept file uploads. To upload a file, send a `multipart/form-data` request instead of JSON.
+You can combine file uploads with other parameters in the same request.
+
+__Example using curl:__
+
+```bash
+curl -X PUT \
+  -H "Authorization: Bearer put-your-access-token-here" \
+  -F "user[name]=David H. Hansson" \
+  -F "user[avatar]=@/path/to/avatar.jpg" \
+  http://fizzy.localhost:3006/686465299/users/03f5v9zjw7pz8717a4no1h8a7
+```
+
 ## Endpoints
 
 ### Identity
@@ -270,6 +285,102 @@ Columns represent stages in a workflow on a board. Cards move through columns as
 
 Users represent people who have access to an account.
 
+#### `GET /:account_slug/users`
+
+Returns a list of active users in the account.
+
+__Response:__
+
+```json
+[
+  {
+    "id": "03f5v9zjw7pz8717a4no1h8a7",
+    "name": "David Heinemeier Hansson",
+    "role": "owner",
+    "active": true,
+    "email_address": "david@example.com",
+    "created_at": "2025-12-05T19:36:35.401Z",
+    "url": "http://fizzy.localhost:3006/897362094/users/03f5v9zjw7pz8717a4no1h8a7"
+  },
+  {
+    "id": "03f5v9zjysoy0fqs9yg0ei3hq",
+    "name": "Jason Fried",
+    "role": "member",
+    "active": true,
+    "email_address": "jason@example.com",
+    "created_at": "2025-12-05T19:36:35.419Z",
+    "url": "http://fizzy.localhost:3006/897362094/users/03f5v9zjysoy0fqs9yg0ei3hq"
+  },
+  {
+    "id": "03f5v9zk1dtqduod5bkhv3k8m",
+    "name": "Jason Zimdars",
+    "role": "member",
+    "active": true,
+    "email_address": "jz@example.com",
+    "created_at": "2025-12-05T19:36:35.435Z",
+    "url": "http://fizzy.localhost:3006/897362094/users/03f5v9zk1dtqduod5bkhv3k8m"
+  },
+  {
+    "id": "03f5v9zk3nw9ja92e7s4h2wbe",
+    "name": "Kevin Mcconnell",
+    "role": "member",
+    "active": true,
+    "email_address": "kevin@example.com",
+    "created_at": "2025-12-05T19:36:35.451Z",
+    "url": "http://fizzy.localhost:3006/897362094/users/03f5v9zk3nw9ja92e7s4h2wbe"
+  }
+]
+```
+
+#### `GET /:account_slug/users/:user_id`
+
+Returns the specified user.
+
+__Response:__
+
+```json
+{
+  "id": "03f5v9zjw7pz8717a4no1h8a7",
+  "name": "David Heinemeier Hansson",
+  "role": "owner",
+  "active": true,
+  "email_address": "david@example.com",
+  "created_at": "2025-12-05T19:36:35.401Z",
+  "url": "http://fizzy.localhost:3006/897362094/users/03f5v9zjw7pz8717a4no1h8a7"
+}
+```
+
+#### `PUT /:account_slug/users/:user_id`
+
+Updates a user. You can only update users you have permission to change.
+
+| Parameter | Type | Required | Description |
+|-----------|------|----------|-------------|
+| `name` | string | No | The user's display name |
+| `avatar` | file | No | The user's avatar image |
+
+__Request:__
+
+```json
+{
+  "user": {
+    "name": "David H. Hansson"
+  }
+}
+```
+
+__Response:__
+
+Returns `204 No Content` on success.
+
+#### `DELETE /:account_slug/users/:user_id`
+
+Deactivates a user. You can only deactivate users you have permission to change.
+
+__Response:__
+
+Returns `204 No Content` on success.
+
 ### Notifications
 
 Notifications inform users about events that happened in the account, such as comments, assignments, and card updates.