diff -r 985f1992895d -r 780ef37e63b9 DependencyInjection/Configuration.php
--- a/DependencyInjection/Configuration.php	Thu Oct 27 21:37:34 2011 +0200
+++ b/DependencyInjection/Configuration.php	Thu Oct 27 22:22:36 2011 +0200
@@ -22,7 +22,8 @@
         
         $rootNode
             ->children()
-                ->scalarNode('document_class')->end()
+                ->scalarNode('route_for_documents_by_tag')->defaultNull()->end()
+                ->scalarNode('document_class')->isRequired()->end()
                 ->scalarNode('document_id_column')->defaultValue('id')->end()
             ->end()
             ->fixXmlConfig('field')