diff --git a/doc/comedilib.sgml b/doc/comedilib.sgml
index fe330e1..0d9ec8c 100644
--- a/doc/comedilib.sgml
+++ b/doc/comedilib.sgml
@@ -1,5 +1,4 @@
-<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook V3.1//EN"
-	"docbook/dtd/3.1/docbook.dtd" [
+<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook V3.1//EN" [
 <!ENTITY intro SYSTEM "intro.sgml">
 <!ENTITY install SYSTEM "install.sgml">
 <!ENTITY tutorial SYSTEM "tutorial.sgml">
@@ -53,6 +52,14 @@ handbook
   <year>1998-2003</year>
   <holder>David Schleef</holder>
  </copyright>
+ <copyright>
+  <year>2001-2003</year>
+  <holder>Frank Mori Hess</holder>
+ </copyright>
+ <copyright>
+  <year>2002-2003</year>
+  <holder>Herman Bruyninckx</holder>
+ </copyright>
 
  <abstract>
  <para>