diff --git a/.travis.yml b/.travis.yml
index b540bad..d3375de 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 sudo: false
 language: python
+python:
+  - "3.6"
 install: pip install sphinx
-script: 
-- make doctest
-- make html
+script:
+  - make doctest
+  - make html