diff --git a/en_US.ISO8859-1/articles/contributing/article.sgml b/en_US.ISO8859-1/articles/contributing/article.sgml
index 08b4ba78f2..643c614a69 100644
--- a/en_US.ISO8859-1/articles/contributing/article.sgml
+++ b/en_US.ISO8859-1/articles/contributing/article.sgml
@@ -1,7 +1,7 @@
 <!--
      The FreeBSD Documentation Project
 
-     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml,v 1.259 2000/07/16 15:52:27 alex Exp $
+     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml,v 1.260 2000/07/16 16:15:26 alex Exp $
 -->
 
 <chapter id="contrib">
@@ -2911,7 +2911,7 @@ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
       </listitem>
 
       <listitem>
-        <para>Joachim Kuebart <email>unknown</email></para>
+        <para>Joachim Kuebart <email>kuebart@mathematik.uni-ulm.de</email></para>
       </listitem>
 
       <listitem>
diff --git a/en_US.ISO8859-1/books/handbook/contrib/chapter.sgml b/en_US.ISO8859-1/books/handbook/contrib/chapter.sgml
index 08b4ba78f2..643c614a69 100644
--- a/en_US.ISO8859-1/books/handbook/contrib/chapter.sgml
+++ b/en_US.ISO8859-1/books/handbook/contrib/chapter.sgml
@@ -1,7 +1,7 @@
 <!--
      The FreeBSD Documentation Project
 
-     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml,v 1.259 2000/07/16 15:52:27 alex Exp $
+     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml,v 1.260 2000/07/16 16:15:26 alex Exp $
 -->
 
 <chapter id="contrib">
@@ -2911,7 +2911,7 @@ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
       </listitem>
 
       <listitem>
-        <para>Joachim Kuebart <email>unknown</email></para>
+        <para>Joachim Kuebart <email>kuebart@mathematik.uni-ulm.de</email></para>
       </listitem>
 
       <listitem>
diff --git a/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml b/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml
index 08b4ba78f2..643c614a69 100644
--- a/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml
+++ b/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml
@@ -1,7 +1,7 @@
 <!--
      The FreeBSD Documentation Project
 
-     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml,v 1.259 2000/07/16 15:52:27 alex Exp $
+     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/contrib/chapter.sgml,v 1.260 2000/07/16 16:15:26 alex Exp $
 -->
 
 <chapter id="contrib">
@@ -2911,7 +2911,7 @@ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
       </listitem>
 
       <listitem>
-        <para>Joachim Kuebart <email>unknown</email></para>
+        <para>Joachim Kuebart <email>kuebart@mathematik.uni-ulm.de</email></para>
       </listitem>
 
       <listitem>