From 524359f9f7cf2cbd168bcc8464d05684b6774181 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Tue, 11 Jan 2011 22:08:55 +0000
Subject: Add comment.

---
 Lib/functools.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/functools.py b/Lib/functools.py
index 1062a45..03de69a 100644
--- a/Lib/functools.py
+++ b/Lib/functools.py
@@ -141,7 +141,7 @@ def lru_cache(maxsize=100):
 
         hits = misses = 0
         kwd_mark = object()             # separates positional and keyword args
-        lock = Lock()
+        lock = Lock()                   # needed because ordereddicts aren't threadsafe
 
         if maxsize is None:
             cache = dict()              # simple cache without ordering or size limit
-- 
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