diff --git a/activerecord/lib/active_record/serializers/xml_serializer.rb b/activerecord/lib/active_record/serializers/xml_serializer.rb
index 5a140019eb7d461edb1aced3075939bee3ab05bc..16448bae77f6e912f8b024e99f0eb413a3540afa 100644
--- a/activerecord/lib/active_record/serializers/xml_serializer.rb
+++ b/activerecord/lib/active_record/serializers/xml_serializer.rb
@@ -52,7 +52,7 @@ module Serialization
     #     <id type="integer">1</id>
     #     <rating type="integer">1</rating>
     #     <name>37signals</name>
-    #     <clients>
+    #     <clients type="array">
     #       <client>
     #         <rating type="integer">1</rating>
     #         <name>Summit</name>