diff --git a/.travis.yml b/.travis.yml
index 73cd1f1b9..f1e368ca1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,4 +20,5 @@ script:
 before_install:
   # gem install must be run with sudo on OSX
   - sudo gem install asciidoctor | gem install asciidoctor
+  # Different behaviour between Linux and OSX
   - sudo apt-get install python-docutils | sudo pip install docutils