diff --git a/docs/ref/models/options.txt b/docs/ref/models/options.txt
index 91f684bd8e..6569c774e8 100644
--- a/docs/ref/models/options.txt
+++ b/docs/ref/models/options.txt
@@ -300,6 +300,9 @@ Django quotes column and table names behind the scenes.
 
         ordering = ['-pub_date', 'author']
 
+    Default ordering also affects :ref:`aggregation queries
+    <aggregation-ordering-interaction>`.
+
 .. warning::
 
     Ordering is not a free operation. Each field you add to the ordering
diff --git a/docs/topics/db/aggregation.txt b/docs/topics/db/aggregation.txt
index 47563338d6..aa56a8b4eb 100644
--- a/docs/topics/db/aggregation.txt
+++ b/docs/topics/db/aggregation.txt
@@ -479,6 +479,8 @@ will be automatically added to the result set. However, if the ``values()``
 clause is applied after the ``annotate()`` clause, you need to explicitly
 include the aggregate column.
 
+.. _aggregation-ordering-interaction:
+
 Interaction with default ordering or ``order_by()``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~