diff --git a/app/views/layouts/base_courses.html.erb b/app/views/layouts/base_courses.html.erb
index bc665ea41..6cdc19471 100644
--- a/app/views/layouts/base_courses.html.erb
+++ b/app/views/layouts/base_courses.html.erb
@@ -24,7 +24,7 @@
 </head>
 <!--add by huang-->
 <body class="<%= h body_css_classes %>">
-<!-- <#%= render :partial => 'courses/course_ad' %> -->
+<%= render :partial => 'courses/course_ad' %>
 <div id="wrapper">
 <div id="wrapper2">
 <div id="wrapper3">
