Configuring.md

@@ -13,6 +13,9 @@ These are the keys available to configure general features:
 <a name="eager_load"></a>`eager_load` Set if any information that requires querying and searching or collecting information should be eager loaded. This automatically changes when rails same configuration is set to true.  
 Default value: `false`
 
+<a name="use_extended_defaults"></a>`use_extended_defaults` This allows default values to have extended values like arrays and casted values. Extended defaults are still experimental, so enable and test it before using it in prod.  
+Default value: `false`
+
 <a name="irregular_models"></a>`irregular_models` Set a list of irregular model names when associated with table names. It uses the `'table_name' => 'model_name'` format. This is widely used for inheritance because record types need to be associated with a model class.  
 Default value: `{}`