diff --git a/reference/image/constants.xml b/reference/image/constants.xml
index cc8d57c081..226e28a1ac 100644
--- a/reference/image/constants.xml
+++ b/reference/image/constants.xml
@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
+<!-- $Revision: 1.2 $ -->
 <section id="image.constants">
  &reftitle.constants;
  &extension.constants;