diff --git a/doc/index.docbook b/doc/index.docbook
index 208262c..781f91e 100644
--- a/doc/index.docbook
+++ b/doc/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 k3b "<application>K3b</application>">
 <!ENTITY cdrdao "<application>cdrdao</application>">
 <!ENTITY dvdtools "<application>DVD+RW-Tools</application>">