diff --git a/docs/Lagrange.OneBot/API/Extend/index.md b/docs/Lagrange.OneBot/API/Extend/index.md
index 235efea7..b4c815e5 100644
--- a/docs/Lagrange.OneBot/API/Extend/index.md
+++ b/docs/Lagrange.OneBot/API/Extend/index.md
@@ -1 +1,52 @@
-# 拓展API
\ No newline at end of file
+# 拓展API
+
+## 构造合并转发消息
+
+**方法名**：
+`send_forward_msg`
+
+**参数**
+
+| 字段 | 类型 | 说明 |
+| --- | --- | --- |
+| `messages` | list[OneBotSegment.node] | 参考下方 |
+
+其中`OneBotSegment.node`的`data`部分要求如下
+
+| 字段 | 类型 | 说明 |
+| --- | --- | --- |
+| `name` | string | 自定义消息发送者昵称 |
+| `uin`  | string | 自定义消息发送者QQ号 |
+| `content` | list[OneBotSegment] | 消息内容 |
+
+**响应数据**
+
+| 字段 | 类型  | 说明 |
+| --- | --- | --- |
+| `resid` | string | Resid |
+
+:::tip
+**发送合并转发消息**
+
+请使用标准消息发送API发送一个`"type": "forward", "id": Resid`的`OneBotSegment`消息
+
+
+**参考代码**
+
+::: code-group
+
+```python{10-11} [Nonebot OneBot V11]
+from nonebot.adapters.onebot.v11 import MessageSegment
+
+async def test_send_forward_message(target_id: int):
+    messages = [
+        {
+            "type": "node",
+            "data": {"name": "小助手", "uin": "2854196310", "content": [MessageSegment.text("测试消息")]},
+        }
+    ]
+    res_id = await bot.call_api("send_forward_msg", messages=messages)
+    await bot.send_group_msg(group_id=target_id, message=MessageSegment.forward(res_id))
+```
+
+:::