diff --git a/doc/3. Customization/Examples.md b/doc/3. Customization/Examples.md
index 0181828..d46cb0f 100644
--- a/doc/3. Customization/Examples.md	
+++ b/doc/3. Customization/Examples.md	
@@ -1,14 +1,18 @@
 # Examples
 
-- [Classes](#classes)  
-  - [Prices with discounts to icml](#prices-with-discounts-to-icml)
-- [Filters](#filters)  
+- [Classes](#classes)
+    - [Prices with discounts to icml](#prices-with-discounts-to-icml)
+- [Filters](#filters)
+    - [Set order custom field on status change](#set-order-custom-field-on-status-change)
 
 ## Classes
+
 ### Prices with discounts to ICML
+
 Customization for generate ICML catalog with prices including discounts
 
 Put code to  `.../retailcrm/custom/classes/RetailcrmCatalog.php`:
+
 ```php
 <...>
 $price = !empty($product['rate'])
@@ -40,12 +44,44 @@ if (!empty($product['manufacturer_name'])) {
 ```
 
 ## Filters
-### ...
-...
 
-Put code to  `...`:
+### Set order custom field on status change
+
+Put code to `custom/filters/RetailcrmFilterOrderStatusUpdate.php`:
+
 ```php
-<...>
-code
-<...>
+<?php
+// custom/filters/RetailcrmFilterOrderStatusUpdate.php
+
+class RetailcrmFilterOrderStatusUpdate implements RetailcrmFilterInterface
+{
+    /**
+     * {@inheritDoc}
+     */
+    public static function filter($object, array $parameters)
+    {
+        // get data from Order object
+        $order = new Order($parameters['id_order']);
+        
+        $trackingNumbers = [];
+        foreach ($order->getShipping() as $shipping) {
+            $trackingNumbers[] = $shipping['tracking_number'];
+        }
+        
+        $object['customFields']['tracking'] = implode(', ', $trackingNumbers);
+
+        // get data from the database
+        $sql = 'SELECT important_data FROM ' . _DB_PREFIX_ . 'important_table 
+                WHERE id_order = ' . pSQL($order->id);
+
+        $data = [];
+        foreach (Db::getInstance()->ExecuteS($sql) as $row) {
+            $data[] = $row['important_data'];
+        }
+
+        $object['customFields']['important_data'] = implode(', ', $data);
+
+        return $object;
+    }
+}
 ```
diff --git a/doc/3. Customization/Filters.md b/doc/3. Customization/Filters.md
index caee29c..8a82b09 100644
--- a/doc/3. Customization/Filters.md	
+++ b/doc/3. Customization/Filters.md	
@@ -3,45 +3,17 @@
 ## Usage
 
 If you want to modify data, sent between CRM and CMS you can use custom filters.
-To use filters you should define a new class in `<prestashop-root>/modules/retailcrm/custom/hooks`. Filename and classname must match the filter name.
+To use filters you should define a new class in `<prestashop-root>/modules/retailcrm/custom/filters`. Filename and classname must match the filter name.
 Filter class should implement interface *RetailcrmFilterInterface*. In filter class you must define *filter()* function, which will take initial `$object` and return customized `$object`.
 
-## Example
-
-The example below shows you how to customize address data, loaded from CRM history during back sync:
-
-```php
-<?php
-// custom/hooks/RetailcrmFilterSaveCustomerAddress.php
-
-class RetailcrmFilterSaveCustomerAddress implements RetailcrmFilterInterface
-{
-    /**
-     * @inheritDoc
-     */
-    public static function filter($object, array $parameters)
-    {
-        /**
-         * @var array $dataCrm CRM address data
-         * @var Address $object  CMS Address object
-         */
-
-        $dataCrm = $parameters['dataCrm'];
-
-        if (isset($dataCrm['dni'])) {
-            $object->dni = $dataCrm['dni'];
-        }
-
-        return $object;
-    }
-}
-```
+You can see more examples on the [Examples](Examples.md) page
 
 ## List of filters
 
 There are list of available filters:
 
 * *RetailcrmFilterProcessOrder* - order array, which will be sent to CRM
+* *RetailcrmFilterOrderStatusUpdate* - order array, which will be sent to CRM when the status is changed
 * *RetailcrmFilterProcessCustomer* - customer array, which will be sent to CRM
 * *RetailcrmFilterProcessCustomerCorporate* - corporate customer array, which will be sent to CRM
 * *RetailcrmFilterProcessAddress* - address array, which will be sent to CRM
diff --git a/retailcrm/retailcrm.php b/retailcrm/retailcrm.php
index 826529d..d0a29a0 100644
--- a/retailcrm/retailcrm.php
+++ b/retailcrm/retailcrm.php
@@ -853,19 +853,20 @@ class RetailCRM extends Module
 
             return false;
         } elseif (isset($params['newOrderStatus'])) {
+            $order = [
+                'externalId' => $params['id_order'],
+            ];
+
             $statusCode = $params['newOrderStatus']->id;
 
             if (array_key_exists($statusCode, $status) && !empty($status[$statusCode])) {
-                $orderStatus = $status[$statusCode];
+                $order['status'] = $status[$statusCode];
             }
 
-            if (isset($orderStatus)) {
-                $this->api->ordersEdit(
-                    [
-                        'externalId' => $params['id_order'],
-                        'status' => $orderStatus,
-                    ]
-                );
+            $order = RetailcrmTools::filter('RetailcrmFilterOrderStatusUpdate', $order, $params);
+
+            if (isset($order['externalId']) && 1 < count($order)) {
+                $this->api->ordersEdit($order);
 
                 return true;
             }
diff --git a/tests/RetailcrmTest.php b/tests/RetailcrmTest.php
index 7cad122..bb879be 100644
--- a/tests/RetailcrmTest.php
+++ b/tests/RetailcrmTest.php
@@ -234,7 +234,7 @@ class RetailCRMTest extends RetailcrmTestCase
         $cart = $this->createMock('Cart');
         $cart->expects($this->any())->method('getProducts')->willReturn($this->getProducts());
         $cart->expects($this->any())->method('getAddressCollection')->willReturn($this->getAddressCollection());
-        $status = new StdClass();
+        $status = new stdClass();
         $reference = $order->reference;
         $updReference = 'test';