diff --git a/doc/ru/index.docbook b/doc/ru/index.docbook
index 2dc9dce..4cced45 100644
--- a/doc/ru/index.docbook
+++ b/doc/ru/index.docbook
@@ -1,6 +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 kappname "KSquirrel">
   <!ENTITY klibname "ksquirrel-libs">
   <!ENTITY Dmitry.Baryshev "<firstname>Дмитрий</firstname> <othername>Алексеевич</othername> <surname>Барышев</surname>">