diff --git a/chapter01/01-HelloWorld.html b/chapter01/01-HelloWorld.html
index f7eca1bf..2711cd32 100644
--- a/chapter01/01-HelloWorld.html
+++ b/chapter01/01-HelloWorld.html
@@ -8,7 +8,7 @@
     <script type="text/javascript" src="01-HelloWorld.js"></script>
     <script type="text/javascript">
         /*alert('Hello, World!');
-        console.log('Hello, World!');*/
+        console.log('Hello, World!');*//
     </script>
 </body>
 </html>
\ No newline at end of file