diff --git a/src/main/java/com/guwan/backend/service/impl/UserServiceImpl.java b/src/main/java/com/guwan/backend/service/impl/UserServiceImpl.java
index a30cfde..c22a527 100644
--- a/src/main/java/com/guwan/backend/service/impl/UserServiceImpl.java
+++ b/src/main/java/com/guwan/backend/service/impl/UserServiceImpl.java
@@ -179,7 +179,7 @@ public class UserServiceImpl implements UserService {
         if (principal instanceof CustomUserDetails) {
             return ((CustomUserDetails) principal).getUserId();
         }
-        
+        //demo
         return null;
     }