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+API Subtask procedures
+======================
+
+## createSubtask
+
+- Purpose: **Create a new subtask**
+- Parameters:
+    - **task_id** (integer, required)
+    - **title** (integer, required)
+    - **user_id** (int, optional)
+    - **time_estimated** (int, optional)
+    - **time_spent** (int, optional)
+    - **status** (int, optional)
+- Result on success: **subtask_id**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "createSubtask",
+    "id": 2041554661,
+    "params": {
+        "task_id": 1,
+        "title": "Subtask #1"
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 2041554661,
+    "result": 45
+}
+```
+
+## getSubtask
+
+- Purpose: **Get subtask information**
+- Parameters:
+    - **subtask_id** (integer)
+- Result on success: **subtask properties**
+- Result on failure: **null**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getSubtask",
+    "id": 133184525,
+    "params": {
+        "subtask_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 133184525,
+    "result": {
+        "id": "1",
+        "title": "Subtask #1",
+        "status": "0",
+        "time_estimated": "0",
+        "time_spent": "0",
+        "task_id": "1",
+        "user_id": "0"
+    }
+}
+```
+
+## getAllSubtasks
+
+- Purpose: **Get all available subtasks**
+- Parameters:
+    - **task_id** (integer, required)
+- Result on success: **List of subtasks**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getAllSubtasks",
+    "id": 2087700490,
+    "params": {
+        "task_id": 1
+    }
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 2087700490,
+    "result": [
+        {
+            "id": "1",
+            "title": "Subtask #1",
+            "status": "0",
+            "time_estimated": "0",
+            "time_spent": "0",
+            "task_id": "1",
+            "user_id": "0",
+            "username": null,
+            "name": null,
+            "status_name": "Todo"
+        },
+        ...
+    ]
+}
+```
+
+## updateSubtask
+
+- Purpose: **Update a subtask**
+- Parameters:
+    - **id** (integer, required)
+    - **task_id** (integer, required)
+    - **title** (integer, optional)
+    - **user_id** (integer, optional)
+    - **time_estimated** (integer, optional)
+    - **time_spent** (integer, optional)
+    - **status** (integer, optional)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "updateSubtask",
+    "id": 191749979,
+    "params": {
+        "id": 1,
+        "task_id": 1,
+        "status": 1,
+        "time_spent": 5,
+        "user_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 191749979,
+    "result": true
+}
+```
+
+## removeSubtask
+
+- Purpose: **Remove a subtask**
+- Parameters:
+    - **subtask_id** (integer, required)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "removeSubtask",
+    "id": 1382487306,
+    "params": {
+        "subtask_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 1382487306,
+    "result": true
+}
+```