diff --git a/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml b/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
index 7f990d556d..3cfcfb690d 100644
--- a/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
+++ b/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
@@ -2562,6 +2562,11 @@
         <email>jan.stocker@t-online.de</email></para>
     </listitem>
     
+    <listitem>
+      <para>Jan-Peter Koopmann
+        <email>j.koopmann@seceidos.de</email></para>
+    </listitem>
+    
     <listitem>
       <para>Janick Taillandier
         <email>Janick.Taillandier@ratp.fr</email></para>