diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 6deeacf..436841d 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -70,14 +70,14 @@ Ready to contribute? Here's how to set up `erepublik` for local development.
 
    Now you can make your changes locally.
 
-5. When you're done making changes, check that your changes pass flake8 and the
-   tests, including testing other Python versions with tox::
+5. When you're done making changes, check that your changes pass flake8, isort and the
+   tests::
 
     $ flake8 erepublik tests
-    $ python setup.py test or py.test
-    $ tox
+    $ isort erepublik
+    $ python setup.py test
 
-   To get flake8 and tox, just pip install them into your virtualenv.
+   To get flake8 and isort, just pip install them into your virtualenv.
 
 6. Commit your changes and push your branch to GitHub::