README.md in input_sanitizer-0.2.0 vs README.md in input_sanitizer-0.2.2

@@ -17,16 +17,14 @@
     $ gem install input_sanitizer
 
 ## Usage
 
 ```ruby
-
 class PersonSanitizer < InputSanitizer::Sanitizer
   string :name
   string :address
   integer :height
-  float :weight
   date :birthday
 end
 
 # filters unwanted parameters
 sanitizer = PersonSanitizer.new({:account_id => 1, :name => "John"})
@@ -55,10 +53,18 @@
 
 # it prevents obvious errors
 data = PrivilegedSanitizer.clean({:account_id => 3})
 data[:account] # instead of :account_id
 # => InputSanitizer::KeyNotAllowedError: Key not allowed: account
-# => ...
+
+# supports custom value converters
+class SomethingSanitizer < InputSanitizer::Sanitizer
+  custom :backward, :converter => lambda { |v| v.reverse }
+  integer :version
+  custom :name, :provide => :version, :converter => lambda { |name, version|
+    version < 3 ? name.downcase : name
+  }
+end
 ```
 
 
 ## Contributing