diff --git a/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml b/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
index 40e0b3dd7a..a0b5bf90ff 100644
--- a/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
+++ b/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
@@ -2922,6 +2922,11 @@
         <email>J.Kois@web.de</email></para>
     </listitem>
     
+    <listitem>
+      <para>Johan Karlsson
+        <email>k@numeri.campus.luth.se</email></para>
+    </listitem>
+
     <listitem>
       <para>Johann Tonsing
         <email>jtonsing@mikom.csir.co.za</email></para>