From 4d9b5c60f958320fb80f968a312eb83cf48258d5 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 23 Nov 2016 11:11:41 +0000
Subject: [PATCH] Comment

---
 synapse/app/federation_sender.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/synapse/app/federation_sender.py b/synapse/app/federation_sender.py
index dcdbe79a1..80ea4c806 100644
--- a/synapse/app/federation_sender.py
+++ b/synapse/app/federation_sender.py
@@ -237,6 +237,9 @@ class FederationSenderHandler(object):
         stream_id = yield self.store.get_federation_out_pos("federation")
         defer.returnValue({
             "federation": stream_id,
+
+            # Ack stuff we've "processed", this should only be called from
+            # one process.
             "federation_ack": stream_id,
         })