From deb0237166afe280847b625260620d8fb675f7d7 Mon Sep 17 00:00:00 2001
From: Mark Haines <mark.haines@matrix.org>
Date: Tue, 5 May 2015 17:45:11 +0100
Subject: [PATCH] Add some doc-string

---
 synapse/storage/_base.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index ccf9697fa..dbef179b2 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -194,6 +194,10 @@ class LoggingTransaction(object):
         object.__setattr__(self, "after_callbacks", after_callbacks)
 
     def call_after(self, callback, *args):
+        """Call the given callback on the main twisted thread after the
+        transaction has finished. Used to invalidate the caches on the
+        correct thread.
+        """
         self.after_callbacks.append((callback, args))
 
     def __getattr__(self, name):