diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 741f2689f30f8c5714273cb03830c273ae6991d3..eb781871e5f3640e5c70e6a303d03f029cb762e5 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -4681,6 +4681,9 @@
         <optional>
           <ref name="address"/>
         </optional>
+        <optional>
+          <ref name="alias"/>
+        </optional>
       </interleave>
     </element>
   </define>