local DTD commented out

doc/seruser/seruser.sgml

@@ -1,5 +1,6 @@
 <!-- $Id$ -->
 <!DOCTYPE Book PUBLIC "-//OASIS//DTD DocBook V4.2//EN">
+<!-- local: DOCTYPE Book SYSTEM "/usr/share/sgml/docbook/dtd-4.2/docbook.dtd" -->
 
 
 <book label="seruser" id="seruser" lang="EN">