diff --git a/synapse/storage/databases/main/registration.py b/synapse/storage/databases/main/registration.py
index bb7b10a793..b20de46116 100644
--- a/synapse/storage/databases/main/registration.py
+++ b/synapse/storage/databases/main/registration.py
@@ -139,9 +139,7 @@ class RegistrationWorkerStore(CacheInvalidationWorkerStore):
         Args:
             token: The access token of a user.
         Returns:
-            None, if the token did not match, otherwise dict
-            including the keys `name`, `is_guest`, `device_id`, `token_id`,
-            `valid_until_ms`.
+            None, if the token did not match, otherwise a `TokenLookupResult`
         """
         return await self.db_pool.runInteraction(
             "get_user_by_access_token", self._query_for_auth, token