diff --git a/doc/en/index.docbook b/doc/en/index.docbook
index 5906863..eaff9e3 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 bookreader "<application>BookReader 0.1</application>">
   <!ENTITY kappname "&bookreader;"><!-- Do *not* replace kappname-->
   <!ENTITY package "kde-module"><!-- tdebase, tdeadmin, etc -->