diff --git a/pisi-spec.rng b/pisi-spec.rng
index 21dd58d7..58726e39 100644
--- a/pisi-spec.rng
+++ b/pisi-spec.rng
@@ -1442,6 +1442,9 @@
         <optional>
             <attribute name="owner"/>
         </optional>
+        <optional>
+            <attribute name="group"/>
+        </optional>
     </define>
 
     <!-- RuntimeDependencies -->