diff --git a/app/chain/subscribe.py b/app/chain/subscribe.py
index 0cd5a72f..0953eda1 100644
--- a/app/chain/subscribe.py
+++ b/app/chain/subscribe.py
@@ -387,6 +387,8 @@ class SubscribeChain(ChainBase):
         删除订阅
         """
         if not arg_str:
+            self.post_message(title="请输入正确的命令格式：/subscribe_delete [id]，"
+                                    "[id]为订阅编号", userid=userid)
             return
         arg_str = arg_str.strip()
         if not arg_str.isdigit():