diff --git a/tox.ini b/tox.ini
index 9ac61b98..07eb8129 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py34,py27,pep8
+envlist = py34,py27,pep8,docs
 
 [testenv]
 deps = -r{toxinidir}/test-requirements.txt