diff --git a/tests/testapp/models/many_to_one_null.py b/tests/testapp/models/many_to_one_null.py
index dcf6373e68..c3c92601f7 100644
--- a/tests/testapp/models/many_to_one_null.py
+++ b/tests/testapp/models/many_to_one_null.py
@@ -1,7 +1,8 @@
 """
 16. Many-to-one relationships that can be null
 
-To define a many-to-one relationship, use ``ForeignKey()`` with ``null=True`` .
+To define a many-to-one relationship that can have a null foreign key, use
+``ForeignKey()`` with ``null=True`` .
 """
 
 from django.core import meta