From a68abc79fd90465aed6ead3eec1a5704c64a1682 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 19 Jun 2015 11:48:55 +0100
Subject: [PATCH] Add comment on cancellation of observers

---
 synapse/util/async.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/synapse/util/async.py b/synapse/util/async.py
index 6f567bcaa6..5a1d545c96 100644
--- a/synapse/util/async.py
+++ b/synapse/util/async.py
@@ -38,6 +38,9 @@ class ObservableDeferred(object):
     deferred.
 
     If consumeErrors is true errors will be captured from the origin deferred.
+
+    Cancelling or otherwise resolving an observer will not affect the original
+    ObservableDeferred.
     """
 
     __slots__ = ["_deferred", "_observers", "_result"]