diff --git a/docs/topics/_images/django_unittest_classes_hierarchy.png b/docs/topics/_images/django_unittest_classes_hierarchy.png
new file mode 100644
index 0000000000..5f28b56ed6
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diff --git a/docs/topics/testing.txt b/docs/topics/testing.txt
index ef6fb3c9b3..5980740a36 100644
--- a/docs/topics/testing.txt
+++ b/docs/topics/testing.txt
@@ -1089,6 +1089,9 @@ TestCase
 Normal Python unit test classes extend a base class of
 :class:`unittest.TestCase`. Django provides a few extensions of this base class:
 
+.. image:: _images/django_unittest_classes_hierarchy.png
+   :alt: Django hierarchy of unit testing helper classes (TestCase subclasses)
+
 .. class:: TestCase()
 
 This class provides some additional capabilities that can be useful for testing