note that assertCountEqual is newish
diff --git a/documentation/index.rst b/documentation/index.rst
index db47905..3317596 100644
--- a/documentation/index.rst
+++ b/documentation/index.rst
@@ -440,7 +440,7 @@
unittest assertions
>>>>>>>>>>>>>>>>>>>
-Contains compatibility shims for unittest assertions that have been renamed.
+Six contains compatibility shims for unittest assertions that have been renamed.
The parameters are the same as their aliases, but you must pass the test method
as the first argument. For example::
@@ -455,7 +455,8 @@
.. function:: assertCountEqual()
Alias for :meth:`~py3:unittest.TestCase.assertCountEqual` on Python 3 and
- :meth:`~py2:unittest.TestCase.assertItemsEqual` on Python 2.
+ :meth:`~py2:unittest.TestCase.assertItemsEqual` on Python 2. This method is
+ only available on Python 2.7 and later.
.. function:: assertRaisesRegex()
