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-rw-r--r--src/rabbit_backing_queue.erl4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/rabbit_backing_queue.erl b/src/rabbit_backing_queue.erl
index d9c898201c..2dba00ad62 100644
--- a/src/rabbit_backing_queue.erl
+++ b/src/rabbit_backing_queue.erl
@@ -117,7 +117,9 @@ behaviour_info(callbacks) ->
%% manage (either on an empty mailbox, or when a timer fires)?
{needs_sync, 1},
- %% Called (eventually) after needs_sync returns 'true'.
+ %% Called (eventually) after needs_sync returns 'true'. Note this
+ %% may be called more than once for each 'true' returned from
+ %% needs_sync.
{sync, 1},
%% Called immediately before the queue hibernates.