diff --git a/basic_content/const/README.md b/basic_content/const/README.md
index 35e7b11..afed664 100644
--- a/basic_content/const/README.md
+++ b/basic_content/const/README.md
@@ -309,9 +309,11 @@ Apple::Apple(int i):apple_number(i)
 }
 int Apple::add(int num){
     take(num);
+    return num;
 }
 int Apple::add(int num) const{
     take(num);
+    return num;
 }
 void Apple::take(int num) const
 {