diff --git a/tox.ini b/tox.ini
index 79b3fa03..1306ff9c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,9 @@
 [tox]
-envlist = py26,py27
+envlist = py26,py27,docs
 
 [testenv]
 deps=-rrequirements.txt
 commands=./runtests
+
+[testenv:docs]
+commands={envbindir}/mkdocs build