diff --git a/.travis.yml b/.travis.yml
index 4bad36f..7279b77 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,8 @@ php:
   - 7.0
   - hhvm
 
+# This triggers builds to run on the new TravisCI infrastructure.
+# See: http://docs.travis-ci.com/user/workers/container-based-infrastructure/
 sudo: false
 
 matrix: