diff --git a/docs/contributing.rst b/docs/contributing.rst
index 267d466e4..bdda0e2e6 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -71,6 +71,9 @@ The following tools are there to help you:
   experimental, non-production Apache2 install on them.  ``tox -e
   apacheconftest`` can be used to run those specific Apache conf tests.
 
+- ``tox --skip-missing-interpreters`` runs tox while ignoring missing versions
+  of Python needed for running the tests.
+
 - ``tox -e py27``, ``tox -e py26`` etc, run unit tests for specific Python
   versions.
 
@@ -313,7 +316,9 @@ Steps:
 3. Run ``./pep8.travis.sh`` to do a cursory check of your code style.
    Fix any errors.
 4. Run ``tox -e lint`` to check for pylint errors. Fix any errors.
-5. Run ``tox`` to run the entire test suite including coverage. Fix any errors.
+5. Run ``tox --skip-missing-interpreters`` to run the entire test suite
+   including coverage. The ``--skip-missing-interpreters`` argument ignores
+   missing versions of Python needed for running the tests. Fix any errors.
 6. If your code touches communication with an ACME server/Boulder, you
    should run the integration tests, see `integration`_. See `Known Issues`_
    for some common failures that have nothing to do with your code.
diff --git a/tox.ini b/tox.ini
index cb625ba8d..689bbf513 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 
 [tox]
 skipsdist = true
-envlist = py{26,27,33,34,35},py{26,27}-oldest,cover,lint
+envlist = py{26,33,34,35},cover,lint
 
 # nosetest -v => more verbose output, allows to detect busy waiting
 # loops, especially on Travis