Add more documentation to application/filters.php.

application/filters.php

@@ -7,9 +7,38 @@ return array(
 	| Filters
 	|--------------------------------------------------------------------------
 	|
-	| Filters provide a convenient method for filtering access to your route
-	| functions. To make your life easier, we have already setup basic filters
-	| for authentication and CSRF protection.
+	| Filters provide a convenient method for attaching functionality to your
+	| routes. Filters can run either before or after a route is exectued.
+	|
+	| The built-in "before" and "after" filters are called before and after
+	| every request to your application; however, you may create other filters
+	| that can be attached to individual routes.
+	|
+	| Filters also make common tasks such as authentication and CSRF protection
+	| a breeze. If a filter that runs before a route returns a response, that
+	| response will override the route action.
+	|
+	| Let's walk through an example...
+	|
+	| First, define a filter:
+	|
+	|		'simple_filter' => function()
+	|		{
+	|			return 'Filtered!';
+	|		}
+	|
+	| Next, attach the filter to a route:
+	|
+	|		'GET /' => array('before' => 'simple_filter', 'do' => function()
+	|		{
+	|			return 'Hello World!';
+	|		})
+	|
+	| Now every requests to http://example.com will return "Filtered!", since
+	| the filter is overriding the route action by returning a value.
+	|
+	| To make your life easier, we have built authentication and CSRF filters
+	| that are ready to attach to your routes. Enjoy.
 	|
 	| For more information, check out: http://laravel.com/docs/start/routes#filters
 	|