From 79eb339c662f47b2a525d303de941c67f52f0e21 Mon Sep 17 00:00:00 2001
From: Richard van der Hoff <richard@matrix.org>
Date: Tue, 17 Jul 2018 14:53:34 +0100
Subject: [PATCH] add a comment

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

diff --git a/synapse/visibility.py b/synapse/visibility.py
index 202daa680..9b97ea2b8 100644
--- a/synapse/visibility.py
+++ b/synapse/visibility.py
@@ -248,6 +248,8 @@ def filter_events_for_server(store, server_name, events):
             )
             return prune_event(event)
 
+        # state will be None if we decided we didn't need to filter by
+        # room membership.
         if not state:
             return event