Explain why Capybara is useful. closes #818

README.md

@@ -4,14 +4,23 @@
 [![Dependency Status](https://gemnasium.com/jnicklas/capybara.png)](https://gemnasium.com/jnicklas/capybara)
 [![Code Quality](https://codeclimate.com/badge.png)](https://codeclimate.com/github/jnicklas/capybara)
 
-Capybara helps you test Rails and Rack applications by simulating how a real
-user would interact with your app. It is agnostic about the driver running your
-tests and comes with Rack::Test and Selenium support built in. WebKit is
-supported through an external gem.
+Capybara helps you test web applications by simulating how a real user would
+interact with your app. It is agnostic about the driver running your tests and
+comes with Rack::Test and Selenium support built in. WebKit is supported
+through an external gem.
 
 **Need help?** Ask on the mailing list (please do not open an issue on
 GitHub): http://groups.google.com/group/ruby-capybara
 
+## Key benefits
+
+- **No setup** necessary for Rails and Rack application. Works out of the box.
+- **Intuitive API** which mimics the language an actual user would use.
+- **Switch the backend** your tests run against from fast headless mode
+  to an actual browser with no changes to your tests.
+- **Powerful synchronization** features mean you never have to manually wait
+  for aynchronous processes to complete.
+
 ## Setup
 
 To install, type