diff --git a/docs/inbox.md b/docs/inbox.md
new file mode 100644
index 00000000..cd534d38
--- /dev/null
+++ b/docs/inbox.md
@@ -0,0 +1,88 @@
+# /inbox
+
+## Description
+
+Allows to play correspondence chess.
+
+| Name | Description | Required |
+| ---- | ----------- | -------- |
+| `action` | `create`<br/>`read`<br/>`reply` | Yes |
+
+## Usage
+
+### Create an inbox
+
+| Name | Description | Required |
+| ---- | ----------- | -------- |
+| `variant` | `960`<br/>`capablanca`<br/>`capablanca-fischer`<br/>`classical` | Yes |
+| `add` | `fen`<br/>`startPos` | No |
+
+```js
+ws.send('/inbox create classical "{}"');
+```
+
+```text
+{
+  "/inbox": {
+    "action": "create",
+    "hash": "92a984a69050423e7b2e8dd2b9e99a22",
+    "inbox": {
+      "hash": "92a984a69050423e7b2e8dd2b9e99a22",
+      "variant": "classical",
+      "settings": [],
+      "fen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -",
+      "movetext": "",
+      "createdAt": "2023-10-13 10:14:47",
+      "createdBy": 306
+    }
+  }
+}
+```
+
+### Read an inbox
+
+| Name | Description | Required |
+| ---- | ----------- | -------- |
+| `hash` | The unique hash of the game. | Yes |
+
+```js
+ws.send('/inbox read 2624497eebedf72579717cd881400701');
+```
+
+```text
+{
+  "/inbox": {
+    "action": "read",
+    "inbox": {
+      "hash": "2624497eebedf72579717cd881400701",
+      "variant": "classical",
+      "settings": [],
+      "fen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -",
+      "movetext": "",
+      "createdAt": "2023-10-13 10:00:22",
+      "createdBy": 249,
+      "_id": 9
+    }
+  }
+}
+```
+
+### Reply to a chess move
+
+| Name | Description | Required |
+| ---- | ----------- | -------- |
+| `hash` | The unique hash of the game. | Yes |
+| `move` | A chess move in PGN format. | Yes |
+
+```js
+ws.send('/inbox reply 2624497eebedf72579717cd881400701 "e4"');
+```
+
+```text
+{
+  "/inbox": {
+    "action": "reply",
+    "message": "Chess move successfully sent."
+  }
+}
+```
diff --git a/mkdocs.yml b/mkdocs.yml
index 64dbd396..d16765b7 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -13,4 +13,5 @@ pages:
   - /leave: leave.md
   - /rematch: rematch.md
   - /restart: restart.md
+  - /inbox: inbox.md
 theme: readthedocs
diff --git a/src/Command/InboxCommand.php b/src/Command/InboxCommand.php
index f840efb1..86990a4f 100644
--- a/src/Command/InboxCommand.php
+++ b/src/Command/InboxCommand.php
@@ -32,7 +32,7 @@ class InboxCommand extends AbstractCommand
     public function __construct()
     {
         $this->name = '/inbox';
-        $this->description = "Correspondence chess.";
+        $this->description = "Allows to play correspondence chess.";
         $this->params = [
             // mandatory
             'action' => [