Update tests/README.md to use proper sub-directory.

tests/README.md

@@ -7,10 +7,10 @@ for Sass with Compass. https://github.com/Team-Sass/navigator
 
 Navigator works through Ruby, so you need to be running Ruby 1.8.7 or greater, and you to install [Bundler](http://bundler.io/) with `gem install bundler` or, for Mac OS X and other systems requiring administrative privileges, `sudo gem install bundler`.
 
-Once Bundler is installed, run `bundle install` to install libraries required by this project.
+Once Bundler is installed, change to the tests directory and run `bundle install` to install libraries required by this project.
 
 ## Running tests
 
-Once you have everything installed, run `bundle exec rake` to run the tests. This will compile all of the files in your `tests/tests` files into CSS files and compare those files to the files in `tests/controls`. If any of your output file from your tests don't line up with your controls, you'll get a `.diff` file generated of the differences and you'll get a failed assertion. If your Sass won't compile, you'll get a failed assertion.
+Once you have everything installed, change to the tests directory and run `bundle exec rake` to run the tests. This will compile all of the files in your `tests/tests` files into CSS files and compare those files to the files in `tests/controls`. If any of your output file from your tests don't line up with your controls, you'll get a `.diff` file generated of the differences and you'll get a failed assertion. If your Sass won't compile, you'll get a failed assertion.
 
 If you're working off of a known set of good output and you'd like to generate your controls quickly, you can run `bundle exec rake compile`.