diff --git a/1-js/05-data-types/05-array-methods/article.md b/1-js/05-data-types/05-array-methods/article.md
index f96d2a6d..ace4c788 100644
--- a/1-js/05-data-types/05-array-methods/article.md
+++ b/1-js/05-data-types/05-array-methods/article.md
@@ -426,6 +426,7 @@ By the way, if we ever want to know which elements are compared -- nothing preve
 ```js run
 [1, -2, 15, 2, 0, 8].sort(function(a, b) {
   alert( a + " <> " + b );
+  return a - b;
 });
 ```