diff --git a/app/views/test/index.html.erb b/app/views/test/index.html.erb
--- a/app/views/test/index.html.erb
+++ b/app/views/test/index.html.erb
@@ -2,6 +2,11 @@
 
 <h2>Test Interface</h2>
 
+<p>
+  <b>Note:</b> Test interface will be disabled in the last 30 minutes
+   of the contest time on your site.
+</p>
+
 <% if @problems.length==0 %>
   There is no submission
 <% else %>