diff --git a/.travis.yml b/.travis.yml
index 8275323..0fff519 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,10 @@
-# Sample .travis.yml for R projects
-
 language: r
 warnings_are_errors: true
 sudo: required
 
+apt_packages:
+  - libtidy-dev
+
 env:
  global:
    - CRAN: http://cran.rstudio.com