CONTRIBUTING.md in sinatra-assetpack-0.1.7 vs CONTRIBUTING.md in sinatra-assetpack-0.2.0

@@ -16,10 +16,10 @@
 
 6. Submit a pull request and ensure tests passes on travis-ci for all supported ruby versions.
 
 ## Running the tests
 
-As simple as running the `rake` command.
+As simple as running `bundle exec rake` command.
 
 The default `rake` task is `rake test`.
 
 ## Syntax
 
\ No newline at end of file