diff --git a/1-js/05-data-types/03-string/2-check-spam/solution.md b/1-js/05-data-types/03-string/2-check-spam/solution.md
index 893c264970..de8dde57d3 100644
--- a/1-js/05-data-types/03-string/2-check-spam/solution.md
+++ b/1-js/05-data-types/03-string/2-check-spam/solution.md
@@ -1,6 +1,6 @@
 To make the search case-insensitive, let's bring the string to lower case and then search:
 
-```js run
+```js run demo
 function checkSpam(str) {
   let lowerStr = str.toLowerCase();