diff --git a/basic_content/const/class_const/overload_example/apple.cpp b/basic_content/const/class_const/overload_example/apple.cpp
index f0d284f..9addd0d 100644
--- a/basic_content/const/class_const/overload_example/apple.cpp
+++ b/basic_content/const/class_const/overload_example/apple.cpp
@@ -6,7 +6,7 @@ public:
     Apple(int i);
     static const int apple_number;
     void take(int num) const;
-    int add(int num);
+    int add();
     int add(int num) const;
     int getCount() const;
 };