diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index 9e2a6d1ae5..ef917fc9f2 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -73,7 +73,8 @@ class RegistrationConfig(Config):
             - vector.im
             - riot.im
 
-        # Users who register on this homeserver will automatically be joined to these rooms
+        # Users who register on this homeserver will automatically be joined
+        # to these rooms
         #auto_join_rooms:
         #    - "#example:example.com"
         """ % locals()