From 5c4b33e8e6a015904cac5fb4699c1affc528e15b Mon Sep 17 00:00:00 2001
From: Ross Lawley <ross.lawley@gmail.com>
Date: Wed, 9 May 2012 12:13:42 +0100
Subject: [PATCH] Made note stronger re: race condition

Refs #478
---
 mongoengine/queryset.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mongoengine/queryset.py b/mongoengine/queryset.py
index dc5bb808..e3f83c78 100644
--- a/mongoengine/queryset.py
+++ b/mongoengine/queryset.py
@@ -794,7 +794,9 @@ class QuerySet(object):
         keyword argument called :attr:`defaults`.
 
         .. note:: This requires two separate operations and therefore a
-        potential race condition exists.
+        race condition exists.  Because there are no transactions in mongoDB
+        other approaches should be investigated, to ensure you don't
+        accidently duplicate data when using this method.
 
         :param write_options: optional extra keyword arguments used if we
             have to create a new document.