diff --git a/docs/notes/Java 基础.md b/docs/notes/Java 基础.md
index c9342e13..dc71d50f 100644
--- a/docs/notes/Java 基础.md	
+++ b/docs/notes/Java 基础.md	
@@ -720,6 +720,7 @@ class B extends A {
         return ("B and B");
     }
 
+    @Override
     public String show(A obj) {
         return ("B and A");
     }