[1.7.x] Fixed #22710 -- Amended aggregation note for empty QuerySets

Thanks smeaton for report and Joël Rochat for spell check

Backport of 7f27cca5c5 from master

1 files changed, 4 insertions, 3 deletions

diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt
index 2cc05e6a67..6aa8b32a54 100644
--- a/docs/ref/models/querysets.txt
+++ b/docs/ref/models/querysets.txt
@@ -2661,9 +2661,10 @@ aggregate functions, see
 
 .. 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.
+    Aggregation functions return ``None`` when used with an empty
+    ``QuerySet``. For example, the ``Sum`` aggregation function returns ``None``
+    instead of ``0`` if the ``QuerySet`` contains no entries. An exception is
+    ``Count``, which does return ``0`` if the ``QuerySet`` is empty.
 
 Avg
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