From bad8a7dea7e8b9196c2bab6d22161ed01935d3bd Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Mon, 16 Nov 2015 23:08:06 -0800
Subject: [PATCH] Document pandas' better groupby performance.

cf. #659.
---
 doc/groupby.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/doc/groupby.rst b/doc/groupby.rst
index 47455018f83..853d3c1e70e 100644
--- a/doc/groupby.rst
+++ b/doc/groupby.rst
@@ -15,7 +15,9 @@ __ http://www.jstatsoft.org/v40/i01/paper
 
 Group by operations work on both :py:class:`~xray.Dataset` and
 :py:class:`~xray.DataArray` objects. Currently, you can only group by a single
-one-dimensional variable (eventually, we hope to remove this limitation).
+one-dimensional variable (eventually, we hope to remove this limitation). Also,
+note that for one-dimensional data, it is usually faster to rely on pandas'
+implementation of the same pipeline.
 
 Split
 ~~~~~