1 files changed, 4 insertions, 2 deletions
diff --git a/synapse/storage/registration.py b/synapse/storage/registration.py
index 26ef1cfd8a..9a92b35361 100644
--- a/synapse/storage/registration.py
+++ b/synapse/storage/registration.py
@@ -81,14 +81,16 @@ class RegistrationStore(SQLBaseStore):
         )
 
     @defer.inlineCallbacks
-    def register(self, user_id, token, password_hash,
+    def register(self, user_id, token=None, password_hash=None,
                  was_guest=False, make_guest=False, appservice_id=None,
                  create_profile_with_localpart=None, admin=False):
         """Attempts to register an account.
 
         Args:
             user_id (str): The desired user ID to register.
-            token (str): The desired access token to use for this user.
+            token (str): The desired access token to use for this user. If this
+                is not None, the given access token is associated with the user
+                id.
             password_hash (str): Optional. The password hash for this user.
             was_guest (bool): Optional. Whether this is a guest account being
                 upgraded to a non-guest account.