diff --git a/doc/k9copy/index.docbook b/doc/k9copy/index.docbook
index 9ee123e..30fb7bf 100644
--- a/doc/k9copy/index.docbook
+++ b/doc/k9copy/index.docbook
@@ -1,5 +1,5 @@
 <?xml version="1.0" ?>
-<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.1.2-Based Variant V1.0//EN" "dtd/kdex.dtd" [
+<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [
   <!-- Define an entity for your application if it is not part of KDE
        CVS -->
   <!ENTITY k9copy "<application>k9copy</application>">