diff --git a/src/pfwbged/folder/folder.py b/src/pfwbged/folder/folder.py
index 6b657ed..9ac8457 100644
--- a/src/pfwbged/folder/folder.py
+++ b/src/pfwbged/folder/folder.py
@@ -50,7 +50,7 @@ class IFolder(model.Schema):
     treating_groups = LocalRolesToPrincipals(
         title=_(u"Can edit"),
         required=False,
-        roles_to_assign=('Editor',),
+        roles_to_assign=('Editor', 'Contributor',),
         value_type=schema.Choice(vocabulary=u'collective.dms.basecontent.treating_groups',)
     )
     form.widget(treating_groups=AjaxChosenMultiFieldWidget)