Fix one versionchanged
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index bcb9517..c011be8 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -1936,8 +1936,11 @@
Calling ``main`` actually returns an instance of the ``TestProgram`` class.
This stores the result of the tests run as the ``result`` attribute.
+ .. versionchanged:: 3.1
+ The ``exit`` parameter was added.
+
.. versionchanged:: 3.2
- The ``exit``, ``verbosity``, ``failfast``, ``catchbreak``, ``buffer``,
+ The ``verbosity``, ``failfast``, ``catchbreak``, ``buffer``
and ``warnings`` parameters were added.