From 7c6e96ec1f99289740132135895be83776cc9ca5 Mon Sep 17 00:00:00 2001
From: Guillaume Pannatier <guillaume.pannatier@gmail.com>
Date: Thu, 29 May 2014 08:53:25 +0200
Subject: [PATCH] Fixed #22710 -- Documented aggregation behavior for empty
 QuerySets.

Thanks matklad for the report.
---
 docs/ref/models/querysets.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt
index d47f8d3a7f..0328295c9b 100644
--- a/docs/ref/models/querysets.txt
+++ b/docs/ref/models/querysets.txt
@@ -2631,6 +2631,12 @@ aggregate functions, see
     aggregation on date/time fields in SQLite will raise
     ``NotImplementedError``.
 
+.. admonition:: Note
+
+    Aggregation functions will return ``None`` when used with an empty
+    ``QuerySet``. For example, the ``Count`` aggregation function will return
+    ``None`` instead of ``0`` if the ``QuerySet`` contains no entries.
+
 Avg
 ~~~