diff --git a/sso/services/__init__.py b/sso/services/__init__.py
index 127a8f8..3aa08c4 100644
--- a/sso/services/__init__.py
+++ b/sso/services/__init__.py
@@ -55,10 +55,14 @@ class BaseService():
         """ Reset the user's password """
         return True
 
-    def login(uid):
+    def login(self, uid):
         """ Login the user and provide cookies back """ 
         pass
 
+    def update_groups(self, uid, groups):
+        """" Update the UID's groups based on the provided list """
+        pass
+
 
 class BaseDBService(BaseService):