Make it clearer that you can filter native collections (of arrays or …

…objects)

doc/filter.md

@@ -5,7 +5,9 @@ This guide will show you how to filter any kind of target using a simple languag
 
 Here is a summary of what you will have to do:
 
- * [instantiate the RulerZ engine](writing_rules.md#step-1-instantiate-the-rulerz-engine) ;
+ * [instantiate the RulerZ engine](writing_rules.md#step-1-instantiate-the-rulerz-engine)
+   and be sure to **include an instance of `\RulerZ\Target\Native\Native` to the
+   compilation targets** ;
  * [write a rule](writing_rules.md#step-2-write-a-rule) ;
  * [filter your target](#filter-your-target).
 
@@ -21,6 +23,9 @@ $users = [
 ];
 ```
 
+**Note:** RulerZ will work the same way, whether you want to filter a collection
+of arrays or a collection of objects.
+
 ## Filter your target
 
 Let's say that we want to retrieve the female players having at least 30 points.

doc/index.md

@@ -26,6 +26,7 @@ composer require 'kphoen/rulerz'
 
 ## Cookbooks
 
+ * [Using native PHP arrays or objects](filter.md)
  * [Using Doctrine ORM](cookbooks/doctrine_orm.md)
  * [Using Pomm](cookbooks/pomm.md)
  * [Using Elasticsearch and ruflin/Elastica](cookbooks/ruflin_elastica.md)