README.md in tramway-0.4.1 vs README.md in tramway-0.4.2

@@ -132,13 +132,11 @@
 *app/forms/user_form.rb
 ```ruby
 class UserForm < Tramway::BaseForm
   properties :email, :password, :first_name, :last_name, :phone
 
-  def password=(value)
-    object.password = value if value.present?
-  end
+  normalizes :email, ->(value) { value.strip.downcase }
 end
 ```
 
 **Controllers without Tramway Form**
 
@@ -247,40 +245,56 @@
     end
   end
 end
 ```
 
+### Normalizes
+
+Tramway Form supports `normalizes` method. It's almost the same [as in Rails](https://edgeapi.rubyonrails.org/classes/ActiveRecord/Normalization.html)
+
+```ruby
+class UserForm < Tramway::BaseForme
+  properties :email, :first_name, :last_name
+  
+  normalizes :email, with: ->(value) { value.strip.downcase }
+  normalizes :first_name, :last_name, with: ->(value) { value.strip }
+end
+```
+
+`normalizes` method arguments:
+* `*properties` - collection of properties that will be normalized
+* `with:` - a proc with a normalization
+* `apply_on_nil` - by default is `false`. When `true` Tramway Form applies normalization on `nil` values
+
 ### Form inheritance
 
-Tramway Form supports inheritance of `properties`
+Tramway Form supports inheritance of `properties` and `normalizations`
 
 **Example**
 
 ```ruby
 class UserForm < TramwayForm
   properties :email, :password
+
+  normalizes :email, with: ->(value) { value.strip.downcase }
 end
 
 class AdminForm < UserForm
   properties :permissions
 end
 
 AdminForm.properties # returns [:email, :password, :permissions]
+AdminForm.normalizations # contains the normalization of :email 
 ```
 
 ### Make flexible and extendable forms
 
 Tramway Form properties are not mapped to a model. You're able to make extended forms.
 
 *app/forms/user_form.rb*
 ```ruby
 class UserForm < Tramway::BaseForm
-  properties :email, :password, :full_name
-
-  # RULE: in case password is empty, don't save
-  def password=(value)
-    object.password = value if value.present?
-  end
+  properties :email, :full_name
 
   # EXTENDED FIELD: full name
   def full_name=(value)
     object.first_name = value.split(' ').first
     object.last_name = value.split(' ').last