diff --git a/tox.ini b/tox.ini
index 211afd47..5d16c48b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,6 +12,12 @@ commands =
     coverage run -a src/bitmessagemain.py -t
     coverage run -a -m tests
 
+[testenv:py27-doc]
+deps =
+    .[docs]
+    -r docs/requirements.txt
+commands = python setup.py build_sphinx
+
 [testenv:reset]
 commands = coverage erase