diff --git a/en_US.ISO8859-1/articles/contributors/contrib.additional.xml b/en_US.ISO8859-1/articles/contributors/contrib.additional.xml
index a1cf1da5cc..5e2dd304a4 100644
--- a/en_US.ISO8859-1/articles/contributors/contrib.additional.xml
+++ b/en_US.ISO8859-1/articles/contributors/contrib.additional.xml
@@ -9912,6 +9912,11 @@
       <email>s.mazeland@xs4all.nl</email></para>
   </listitem>
 
+  <listitem>
+    <para>Sijmen J. Mulder
+      <email>ik@sjmulder.nl</email></para>
+  </listitem>
+
   <listitem>
     <para>Silvio Ap Silva
       <email>alvolivre@live.com</email></para>