Update README.md

chikamichi · chikamichi · commit a773269f403b · 2013-04-10T01:21:08.000+03:00
diff --git a/README.md b/README.md
@@ -33,7 +33,7 @@ Clone the repository, create the site and start a local server:
 git clone https://github.com/ruby/www.ruby-lang.org.git
 cd www.ruby-lang.org/
 bundle install
-rake preview
+rake preview # you may need to use bundle exec
 ```
 
 Then, open [http://localhost:4000/](http://localhost:4000/) in your browser.
