DOC Update changelog with list interface changes

en/08_Changelogs/6.0.0.md

@@ -28,6 +28,7 @@ title: 6.0.0 (unreleased)
   - [Changes to some extension hook names](#hooks-renamed)
   - [Strict typing for `Factory` implementations](#factory-strict-typing)
   - [Elemental `TopPage` class names changed](#elemental-top-page)
+  - [List interface changes](#list-interface-changes)
   - [General changes](#api-general)
 - [Other changes](#other-changes)
   - [MySQL 5 no longer supported](#mysql-5-support)
@@ -715,6 +716,12 @@ The class names for the `TopPage` feature in [`dnadesign/silverstripe-elemental`
 
 If you reference any of these classes in your project or module, most likely in config if you have [`tractorcow/silverstripe-fluent`](https://github.com/tractorcow/silverstripe-fluent) installed, then you will need to update the references to the new class names.
 
+### List interface changes {#list-interface-changes}
+
+The [`SS_List`](api:SilverStripe\Model\List\SS_List) interface now includes the methods from the `Filterable`, `Limitable`, and `Sortable` interfaces, which have now been removed. This means that any class that implements `SS_List` must now also implement the methods from those interfaces.
+
+Many of the methods on `SS_List` are now strongly typed, along with the classes that implement it. This means that you will need to ensure that any custom classes that implement `SS_List` have the correct types for the methods that they implement.
+
 ### General changes {#api-general}
 
 - [`DataObject::write()`](api:SilverStripe\ORM\DataObject::write()) has a new boolean `$skipValidation` parameter. This can be useful for scenarios where you want to automatically create a new record with no data initially without restricting how developers can set up their validation rules.