diff --git a/Docs/changelog-4.0.xml b/Docs/changelog-4.0.xml
index fc33b3fdb5e..f0f9aa881f1 100755
--- a/Docs/changelog-4.0.xml
+++ b/Docs/changelog-4.0.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
 "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
 <!--
 This is a dummy changelog file. Don't use it yet.