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-rw-r--r--src/rabbit_backing_queue.erl2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/rabbit_backing_queue.erl b/src/rabbit_backing_queue.erl
index 352e76fd..8603d8d7 100644
--- a/src/rabbit_backing_queue.erl
+++ b/src/rabbit_backing_queue.erl
@@ -77,7 +77,7 @@ behaviour_info(callbacks) ->
{fetch, 2},
%% Acktags supplied are for messages which can now be forgotten
- %% about.
+ %% about. Must return 1 guid per Ack, in the same order as Acks.
{ack, 2},
%% A publish, but in the context of a transaction.