diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 1711d5ac5c..e59b2a3684 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -681,8 +681,7 @@ class RegistrationHandler(BaseHandler):
         Args:
             user_id (str): id of user
             threepid (object): m.login.msisdn auth response
-            token (str): access_token for the user
-            bind_email (bool): true if the client requested the email to be
+            bind_msisdn (bool): true if the client requested the msisdn to be
                 bound at the identity server
         Returns:
             defer.Deferred: