diff --git a/.travis.yml b/.travis.yml
index 1924463..b767c0c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,6 +58,9 @@
 
   - python: "2.7"
     env: TOXENV=pyroma
+
+  - python: "2.7"
+    env: TOXENV=docs
     
   # Let the cryptography master builds fail because they might be triggered by
   # cryptography changes beyond our control.
diff --git a/doc/conf.py b/doc/conf.py
index dd6a334..8277202 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -121,7 +121,7 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'default'
+html_theme = 'classic'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
diff --git a/tox.ini b/tox.ini
index a2b1d72..61e8797 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = {pypy,py26,py27,py33,py34}{,-cryptographyMaster},pypi-readme,check-manifest,flake8,pyroma
+envlist = {pypy,py26,py27,py33,py34}{,-cryptographyMaster},pypi-readme,check-manifest,flake8,pyroma,docs
 
 [testenv]
 whitelist_externals =
@@ -43,3 +43,10 @@
     check-manifest
 commands =
     check-manifest
+
+[testenv:docs]
+deps =
+     sphinx
+basepython = python2.7
+commands =
+     sphinx-build -W -b html doc doc/_build/html