diff --git a/doc/en/index.docbook b/doc/en/index.docbook
index 89f8773..ead955a 100644
--- a/doc/en/index.docbook
+++ b/doc/en/index.docbook
@@ -1,5 +1,5 @@
 <?xml version="1.0" ?>
-<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.1.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [
+<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [
   <!ENTITY potracegui "<application>potracegui 2.0</application>">
   <!ENTITY kappname "&potracegui;"><!-- Do *not* replace kappname-->
   <!ENTITY package "kde-module"><!-- tdebase, tdeadmin, etc -->