diff --git a/xsl/dtd/dtd2boostbook.xsl b/xsl/dtd/dtd2boostbook.xsl
index e76d6df..c0fd969 100644
--- a/xsl/dtd/dtd2boostbook.xsl
+++ b/xsl/dtd/dtd2boostbook.xsl
@@ -18,6 +18,15 @@
   <xsl:key name="attribute-purposes" match="attpurpose" use="@name"/>
 
   <xsl:template match="dtd">
+<xsl:comment>
+   Copyright (c) 2002 Douglas Gregor &lt;doug.gregor -at- gmail.com&gt;
+
+   Distributed under the Boost Software License, Version 1.0.
+   (See accompanying file LICENSE_1_0.txt or copy at
+   http://www.boost.org/LICENSE_1_0.txt)
+
+   This file is automatically generated by dtd2boostbook.xsl
+</xsl:comment>
     <chapter id="reference">
       <title>Reference</title>
       <para>