1 files changed, 21 insertions, 2 deletions
diff --git a/actionpack/lib/system_testing/driver_adapters/capybara_rack_test_driver.rb b/actionpack/lib/system_testing/driver_adapters/capybara_rack_test_driver.rb
index 2890686e29..78abfa05ee 100644
--- a/actionpack/lib/system_testing/driver_adapters/capybara_rack_test_driver.rb
+++ b/actionpack/lib/system_testing/driver_adapters/capybara_rack_test_driver.rb
@@ -1,13 +1,32 @@
 module SystemTesting
   module DriverAdapters
+    # == CapybaraRackTestDriver for System Testing
+    #
+    # This is the default driver for Capybara. This driver does not support
+    # JavaScript because it doesn't open a browser when running the test suite.
+    #
+    # Although it does not support JavaScript testing the
+    # <tt>CapybaraRackTestDriver</tt> is fast and efficient. This driver requires
+    # no setup and becasue it does not need a webserver, additional configuration
+    # is not required.
+    #
+    # The <tt>CapybaraRackTestDriver</tt> only takes one argument for initialization
+    # which is +:useragent+.
+    #
+    # To set the useragent add the following to your
+    # Rails' configuration file:
+    #
+    #   config.system_testing.driver = SystemTesting::DriverAdapters::CapybaraRackTestDriver.new(
+    #     useragent: 'My UserAgent'
+    #   )
     class CapybaraRackTestDriver
       attr_reader :useragent
 
-      def initialize(useragent: 'Capybara')
+      def initialize(useragent: 'Capybara') # :nodoc:
         @useragent = useragent
       end
 
-      def call
+      def call # :nodoc:
         registration
       end