diff --git a/requirements-docs.txt b/requirements-docs.txt
new file mode 100644
index 0000000..ccc5507
--- /dev/null
+++ b/requirements-docs.txt
@@ -0,0 +1 @@
+Sphinx==1.5.4
diff --git a/tox.ini b/tox.ini
index 1657f6a..b60a6c9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,3 +7,14 @@ deps =
     pytest
     nose
     nosexcover
+
+[testenv:docs]
+usedevelop = False
+changedir = docs
+deps = -rrequirements-docs.txt
+
+commands =
+    make html
+
+whitelist_externals =
+    /usr/bin/make