diff --git a/doc/html/hackguide.html b/doc/html/hackguide.html
index 97d1369..8437080 100644
--- a/doc/html/hackguide.html
+++ b/doc/html/hackguide.html
@@ -1,8 +1,8 @@
-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.0//EN">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
 <!--
-  $Id: hackguide.html,v 1.27 2005/12/24 15:37:13 tom Exp $
+  $Id: hackguide.html,v 1.29 2013/05/17 23:29:18 tom Exp $
   ****************************************************************************
-  * Copyright (c) 1998-2003,2005 Free Software Foundation, Inc.              *
+  * Copyright (c) 1998-2010,2012 Free Software Foundation, Inc.              *
   *                                                                          *
   * Permission is hereby granted, free of charge, to any person obtaining a  *
   * copy of this software and associated documentation files (the            *