diff --git a/index.html b/index.html
index afb3591..e0ee223 100644
--- a/index.html
+++ b/index.html
@@ -329,7 +329,7 @@ <h3 id="ModalLabel">API Reference Document</h3>
 	// create first editor
 	var editor = ace.edit("editor");
 	editor.setTheme("ace/theme/tomorrow");
-	editor.session.setMode("ace/mode/c_cpp");
+	editor.session.setMode("ace/mode/javascript");
 	
 	// event handle for webpage
 	function save() {