Create docs/requirements.txt

docs/README.rst

@@ -15,7 +15,7 @@ and all its dependencies run
 
 ::
 
-    pip install 'Sphinx >= 1.3' sphinx_rtd_theme
+    pip install -r requirements.txt
 
 
 Compile the documentation

docs/requirements.txt

@@ -0,0 +1,2 @@
+'Sphinx >= 1.3'
+sphinx_rtd_theme

tox.ini

@@ -82,8 +82,7 @@ deps = {[testenv:py33]deps}
 [docs]
 changedir = docs
 deps =
-    Sphinx
-    sphinx_rtd_theme
+    -rdocs/requirements.txt
 
 [testenv:docs]
 changedir = {[docs]changedir}