diff --git a/1-js/07-object-oriented-programming/08-class-patterns/article.md b/1-js/07-object-oriented-programming/08-class-patterns/article.md
index 92fcd164..83c312a2 100644
--- a/1-js/07-object-oriented-programming/08-class-patterns/article.md
+++ b/1-js/07-object-oriented-programming/08-class-patterns/article.md
@@ -47,7 +47,7 @@ function User(name, birthday) {
 *!*
   // only visible from other methods inside User
   function calcAge() {
-    new Date().getFullYear() - birthday.getFullYear();
+    return new Date().getFullYear() - birthday.getFullYear();
   }
 */!*