diff --git a/site/README.md b/site/README.md
index 27cd67c6..674d8b36 100644
--- a/site/README.md
+++ b/site/README.md
@@ -10,7 +10,7 @@ For information about contributing, see the [Contributing page](http://jekyllrb.
 
 You can preview your contributions before opening a pull request by running from within the directory:
 
-1. `bundle install`
+1. `bundle install --without test test_legacy benchmark`
 2. `bundle exec rake site:preview`
 
 It's just a jekyll site, afterall! :wink: