@@ -1016,6 +1016,9 @@ stored task tombstones will be deleted.
A built-in periodic task will delete the results after this time
(:class:`celery.task.backend_cleanup`).
+A value of :const:`None` or 0 means results will never expire (depending
+on backend specifications).
+
Default is to expire after 1 day.
.. note::
Ask Solem