Update README.md

README.md

@@ -29,6 +29,12 @@ composer require devio/laravel-model-cast
 
 ## Usage
 
+You need at least 2 classes for this to work, a *generic* class which will be the base Model class with all common attributes and the specific casted class which will be resolved using those attributes.
+
+Let's use cars in our example. `Car` will be our generic model and `TeslaCar` and `FordCar` the more specific classes the cars will be resolved to.
+
+The base model should just use the `CastsModel` trait and implement the `getCastedModelClass` method which will be responsible of resolving which class should be this model be casted to based on its attributes data.
+
 ```php
 class Car extends Model implements Castable 
 {
@@ -44,15 +50,29 @@ class Car extends Model implements Castable
   }
 }
 
-class TeslaCar extends Car {
-}
+class TeslaCar extends Car {}
+class FordCar extends Car {}
+
+
+```
+
+That's all to do. The underlying logic will be casting our `Car` instances to `TeslaCar` or `FordCar` when retrieving models:
 
+```php
 $instance = Car::find(1); 
 $instance::class; // -> TeslaCar
+```
 
-$instance = Car::create(['brand' => 'tesla', ...]);
+It will also work right when creating a model using the `create` method:
+
+```php
+$instance = Car::create(['brand' => 'tesla']);
 $instance::class; // -> TeslaCar
+```
+
+Eloquent collections will be casted too:
 
+```php
 $collection = Car::all();
 $collection[0]::class; // -> TeslaCar
 $collection[1]::class; // -> FordCar