diff --git a/src/Senparc.Weixin.Work/Senparc.Weixin.Work/AdvancedAPIs/Chat/ChatApi.cs b/src/Senparc.Weixin.Work/Senparc.Weixin.Work/AdvancedAPIs/Chat/ChatApi.cs
index 34c409b2d3..97e02e171e 100644
--- a/src/Senparc.Weixin.Work/Senparc.Weixin.Work/AdvancedAPIs/Chat/ChatApi.cs
+++ b/src/Senparc.Weixin.Work/Senparc.Weixin.Work/AdvancedAPIs/Chat/ChatApi.cs
@@ -43,6 +43,10 @@
 namespace Senparc.Weixin.Work.AdvancedAPIs
 {
 
+    /// <summary>
+    /// 群聊会话接口
+    /// 文档：https://developer.work.weixin.qq.com/document/path/90245
+    /// </summary>
     [NcApiBind(NeuChar.PlatformType.WeChat_Work, true)]
     public static class ChatApi
     {