Actuall install a thing
diff --git a/tox.ini b/tox.ini
index 9cd0699..a34ad63 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,7 @@
 [testenv:docs]
 deps =
     sphinx
+    sphinxcontrib-spelling
     sphinx_rtd_theme
 basepython = python2.7
 commands =