diff --git a/docs/conf.py b/docs/conf.py
index fd106fa0..6f00536b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -13,7 +13,6 @@
 
 from __future__ import absolute_import, print_function
 import sys, os
-from future import __version__
 import sphinx_bootstrap_theme
 
 # If extensions (or modules to document with autodoc) are in another directory,
diff --git a/tox.ini b/tox.ini
index f5c013f8..1ca3286b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,7 @@
 [tox]
-envlist = py26,py27,py33,py34,py35,py36,py37
+envlist =
+    py{26,27,33,34,35,36,37},
+    docs
 
 [testenv]
 deps =
@@ -7,3 +9,9 @@ deps =
     unittest2
     py26: importlib
 commands = pytest {posargs}
+
+[testenv:docs]
+deps =
+    sphinx
+    sphinx_bootstrap_theme
+commands = sphinx-build docs build