diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -1075,6 +1075,8 @@
       sorted(actual))`` but it works with sequences of unhashable objects as
       well.
 
+      In Python 3, this method is named ``assertCountEqual``.
+
       .. versionadded:: 2.7