From b8255eba2692716ad8456ea96c6d5a8d06a98e80 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 14 Dec 2016 13:49:54 +0000
Subject: [PATCH] Comment

---
 synapse/handlers/federation.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 8f444da87..1d07e4d02 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -252,6 +252,8 @@ class FederationHandler(BaseHandler):
             except:
                 return False
 
+        # Parses mapping `event_id -> (type, state_key) -> state event_id`
+        # to get all state ids that we're interested in.
         event_map = yield self.store.get_events([
             e_id
             for key_to_eid in event_to_state_ids.values()