diff --git a/docs/internals/contributing.txt b/docs/internals/contributing.txt
index c555f205b1..d81c27ad9a 100644
--- a/docs/internals/contributing.txt
+++ b/docs/internals/contributing.txt
@@ -824,9 +824,10 @@ The tests cover:
 
 We appreciate any and all contributions to the test suite!
 
-The Django tests all use the testing infrastructure that ships with Django for
-testing applications. See :ref:`Testing Django applications <topics-testing>`
-for an explanation of how to write new tests.
+The Django tests all use the testing infrastructure that ships with
+Django for testing applications. New tests should use the unittest
+framework. See :ref:`Testing Django applications <topics-testing>` for
+an explanation of how to write new tests.
 
 Running the unit tests
 ----------------------