diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index 675d642819..a6e27859bc 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -1,10 +1,10 @@
 <!--
      The FreeBSD Documentation Project
 
-     $FreeBSD: doc/en_US.ISO_8859-1/books/porters-handbook/book.sgml,v 1.142 2001/04/09 00:33:58 dd Exp $
+     $FreeBSD: doc/en_US.ISO_8859-1/books/porters-handbook/book.sgml,v 1.143 2001/04/17 01:39:30 dd Exp $
 -->
 
-<!DOCTYPE BOOK PUBLIC "-//FreeBSD//DTD DocBook V3.1-Based Extension//EN" [
+<!DOCTYPE BOOK PUBLIC "-//FreeBSD//DTD DocBook V4.1-Based Extension//EN" [
 <!ENTITY % man PUBLIC "-//FreeBSD//ENTITIES DocBook Manual Page Entities//EN">
 %man;
 
diff --git a/en_US.ISO_8859-1/books/porters-handbook/book.sgml b/en_US.ISO_8859-1/books/porters-handbook/book.sgml
index 675d642819..a6e27859bc 100644
--- a/en_US.ISO_8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO_8859-1/books/porters-handbook/book.sgml
@@ -1,10 +1,10 @@
 <!--
      The FreeBSD Documentation Project
 
-     $FreeBSD: doc/en_US.ISO_8859-1/books/porters-handbook/book.sgml,v 1.142 2001/04/09 00:33:58 dd Exp $
+     $FreeBSD: doc/en_US.ISO_8859-1/books/porters-handbook/book.sgml,v 1.143 2001/04/17 01:39:30 dd Exp $
 -->
 
-<!DOCTYPE BOOK PUBLIC "-//FreeBSD//DTD DocBook V3.1-Based Extension//EN" [
+<!DOCTYPE BOOK PUBLIC "-//FreeBSD//DTD DocBook V4.1-Based Extension//EN" [
 <!ENTITY % man PUBLIC "-//FreeBSD//ENTITIES DocBook Manual Page Entities//EN">
 %man;