README.md in brauser-4.0.0 vs README.md in brauser-4.1.0

@@ -69,14 +69,14 @@
 
 ### Querying the browser
 
 Brauser supports querying about name, version, platform, language.
 
-name and platform support querying via the `==` operator, which supports a single value or a list of values. 
+Name and platform support querying via the `==` operator, which supports a single value or a list of values.
 
 ```ruby
-# We talk about the ending ? later.
+# We'll talk about the ending "?" later.
 browser.name == :chrome
 # => true
 browser.name == [:msie, :firefox]
 # => false
 ```
@@ -106,9 +106,37 @@
 # => false
 ```
 
 Name, platform and languages can be either symbols or array of symbols. Version must be a query in the form is `OPERATOR VALUE && ..`, 
 where `OPERATOR` is one of `["<", "<=", "=", "==", ">=", ">"]` and value specifies the version.
+
+### Prevent old browsers to access the Rails application.
+
+If you want to easily prevent a legacy browser to open your application, create a file `supported-browsers.yml` in the `config` folder with a similar content:
+
+```yaml
+---
+chrome: 29
+firefox: 28
+safari: 6.1
+msie: 11
+```
+
+then create a filter in the `ApplicationController`:
+
+```ruby
+class ApplicationController < ActionController::Base
+  # ...
+
+  before_filter do
+    redirect_to(URL) unless browser.supported?(Rails.root + "config/supported-browsers.yml")
+  end
+
+  # ...
+end
+```
+
+and you are set.
 
 ### Adding new browsers, platform and languages.
 
 To add new browsers, simply call `::Brauser::Definitions.register(:browser, :id, ...)`.