diff --git a/extensions/fablabchemnitz/inkscape.extension.rng b/extensions/fablabchemnitz/inkscape.extension.rng
index 07f7b24..24bbbee 100644
--- a/extensions/fablabchemnitz/inkscape.extension.rng
+++ b/extensions/fablabchemnitz/inkscape.extension.rng
@@ -230,6 +230,11 @@
         <element name="menu-tip">
           <text/>
         </element>
+      </optional>
+	  <optional>
+        <element name="icon">
+          <text/>
+        </element>
       </optional>
     </element>
   </define>