diff --git a/core/src/main/resources/hudson/model/UpdateCenter/main.jelly b/core/src/main/resources/hudson/model/UpdateCenter/main.jelly
index e25de4c8a4b8c311f04b7e8758213edeea49b020..19d3200dc83e0a69b4c5ded613eccb113765324e 100644
--- a/core/src/main/resources/hudson/model/UpdateCenter/main.jelly
+++ b/core/src/main/resources/hudson/model/UpdateCenter/main.jelly
@@ -2,6 +2,8 @@
   If necessary, ask the client to fetch update-center data file for us.
   This allows us to avoid proxy related configuration on the server,
   and instead piggy-back on user connection.
+
+  This file is pulled into the layout.jelly
 -->
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
   <j:if test="${it.due}">