diff --git a/README.md b/README.md
index 96e1a33..5b2ba0a 100644
--- a/README.md
+++ b/README.md
@@ -17,10 +17,24 @@ You can test against multiple versions of Python with [tox](http://tox.testrun.o
     pip install tox
     tox
 
+Versions currently tested in tox are:
+
+* CPython 2.7 (also tested in Codeship)
+* CPython 3.4 (also tested in Codeship)
+* CPython 3.5
+* PyPy
+* PyPy3
+
+To install all the relevant runtimes on Fedora 23:
+
+    sudo dnf install python python3 pypy pypy3
+    sudo dnf copr enable -y mstuchli/Python3.5
+    sudo dnf install python35-python3
+
 Continuous integration
 ----------------------
 
 CI is set up in Codeship to run against PRs and commits.
 
 [![Codeship Status for ncoghlan/contextlib2](https://codeship.com/projects/884e9500-3d1a-0133-3eb0-1abe7f570a4c/status?branch=default)](https://codeship.com/projects/102388)
-[![codecov.io](https://codecov.io/bitbucket/ncoghlan/contextlib2/coverage.svg?branch=default)](https://codecov.io/bitbucket/ncoghlan/contextlib2?branch=default)
\ No newline at end of file
+[![codecov.io](https://codecov.io/bitbucket/ncoghlan/contextlib2/coverage.svg?branch=default)](https://codecov.io/bitbucket/ncoghlan/contextlib2?branch=default)
diff --git a/tox.ini b/tox.ini
index 6fddec7..1923cf4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,6 @@
 [tox]
-envlist = py26, py27, pypy, py32, py33, py34, py35, pypy3
+envlist = py27, pypy, py34, py35, pypy3
 
 [testenv]
 commands = {envpython} test_contextlib2.py
 
-[testenv:py26]
-deps = unittest2