diff --git a/CHANGELOG.md b/CHANGELOG.md
index e01ad89..6afc0ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,3 +2,13 @@
 
 ## Current dev changes
 
+## 8.x-1.0-alpha3
+
+- **Breaking change.** Default filename was changed from products.yml to products.xml, because it's allowed by Yandex, and this is better for XML file.
+
+## 8.x-1.0-alpha2
+
+No breaking changes.
+
+- Added first example.
+- Fixed annotation for Shop info.
\ No newline at end of file
diff --git a/docs/real-examples.md b/docs/real-examples.md
new file mode 100644
index 0000000..f071474
--- /dev/null
+++ b/docs/real-examples.md
@@ -0,0 +1,138 @@
+# Real code examples
+
+If you want to contribute, feel free to open the issue.
+
+## Example #1: Simple product from node
+
+Simple example based on nodes.
+
+### 1. Define service
+
+**MYMODULE.services.yml**
+
+```yml
+services:
+  MYMODULE.yandex_yml:
+    class: Drupal\MYMODULE\YandexYmlService
+    arguments: ['@yandex_yml.generator', '@entity_type.manager']
+```
+
+### 2. Create service object
+
+**/src/YandexYmlService.php**
+
+```php
+<?php
+
+namespace Drupal\MYMODULE;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\node\NodeInterface;
+use Drupal\yandex_yml\YandexYmlGenerator;
+
+/**
+ * Class YandexYmlService.
+ */
+class YandexYmlService {
+
+  /**
+   * Generator for YML file.
+   *
+   * @var \Drupal\yandex_yml\YandexYmlGenerator
+   */
+  protected $generator;
+
+  /**
+   * Entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * Constructs a new YandexYmlService object.
+   */
+  public function __construct(YandexYmlGenerator $yandex_yml_generator, EntityTypeManagerInterface $entity_type_manager) {
+    $this->generator = $yandex_yml_generator;
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * Return timestamp of last any product editing.
+   */
+  public function getLastProductUpdateTime() {
+    return \Drupal::database()->select('node_field_data', 'n')
+      ->fields('n', ['changed'])
+      ->condition('n.type', 'NODE_TYPE')
+      ->orderBy('n.changed', 'DESC')
+      ->range(0, 1)
+      ->execute()
+      ->fetchField();
+  }
+
+  /**
+   * Generate result file.
+   */
+  public function generateFile() {
+    /** @var \Drupal\yandex_yml\YandexYml\Shop\YandexYmlShop $shop_info */
+    $shop_info = \Drupal::service('yandex_yml.shop')
+      ->setName('NAME')
+      ->setCompany('FULLNAME')
+      ->setEmail('developer@example.com')
+      ->setCpa(0);
+    $this->generator->setShopInfo($shop_info);
+
+    $spare_parts = $this->entityTypeManager->getStorage('node')
+      ->loadByProperties([
+        'type' => 'NODE_TYPE',
+        'status' => NodeInterface::PUBLISHED,
+      ]);
+
+    /** @var \Drupal\yandex_yml\YandexYml\Currency\YandexYmlCurrency $currency */
+    $currency = \Drupal::service('yandex_yml.currency');
+    $currency->setId('RUB')->setRate(1);
+    $this->generator->addCurrency($currency);
+
+    /** @var NodeInterface $spare_part */
+    foreach ($spare_parts as $spare_part) {
+      /** @var \Drupal\yandex_yml\YandexYml\Offer\YandexYmlOfferSimple $offer */
+      $offer = \Drupal::service('yandex_yml.offer.simple');
+      $offer->setId($spare_part->id())
+        ->setAvailable(TRUE)
+        ->setUrl($spare_part->toUrl('canonical', ['absolute' => TRUE])
+          ->toString(TRUE)
+          ->getGeneratedUrl())
+        ->setCpa(0)
+        ->setName($spare_part->label())
+        ->setVendor($spare_part->field_manufacturer->value)
+        ->setPrice($spare_part->field_price->value)
+        ->setCurrencyId('RUB')
+        ->setDescription($spare_part->body->value);
+      if (!$spare_part->field_image->isEmpty()) {
+        $offer->setPicture($spare_part->field_image->entity->uri->value);
+      }
+      $this->generator->addOffer($offer);
+    }
+
+    $this->generator->generateFile();
+  }
+
+}
+```
+
+### 3. Add cron job
+
+**MYMODULE.module**
+
+```php
+/**
+ * Implements hook_cron().
+ */
+function MYMODULE_cron() {
+  /** @var \Drupal\MYMODULE\YandexYmlService $yandex_yml_generator */
+  $yandex_yml_generator = \Drupal::service('MYMODULE.yandex_yml');
+  if ($yandex_yml_generator->getLastProductUpdateTime() + (60 * 60 * 12) > \Drupal::time()->getRequestTime()) {
+    $yandex_yml_generator->generateFile();
+  }
+}
+```
diff --git a/mkdocs.yml b/mkdocs.yml
index ea8aa10..d32fed5 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -3,4 +3,5 @@ pages:
   - 'Home': index.md
   - 'Installation': installation.md
   - 'How it works': how-it-works.md
-  - 'Generate YML': generate-yml.md
\ No newline at end of file
+  - 'Generate YML': generate-yml.md
+  - 'Real world examples': real-examples.md
\ No newline at end of file
diff --git a/src/YandexYml/Shop/YandexYmlShop.php b/src/YandexYml/Shop/YandexYmlShop.php
index 58ac2e1..6a489b4 100644
--- a/src/YandexYml/Shop/YandexYmlShop.php
+++ b/src/YandexYml/Shop/YandexYmlShop.php
@@ -15,9 +15,7 @@ class YandexYmlShop {
   use YandexYmlToArrayTrait;
 
   /**
-   * @YandexYmlElement(
-   *   name = "name"
-   * )
+   * @YandexYmlElement()
    *
    * @var string
    */
@@ -33,54 +31,42 @@ class YandexYmlShop {
   private $company;
 
   /**
-   * @YandexYmlElement(
-   *   name = "url"
-   * )
+   * @YandexYmlElement()
    *
    * @var string
    */
   private $url;
 
   /**
-   * @YandexYmlElement(
-   *   name = "url"
-   * )
+   * @YandexYmlElement()
    *
    * @var string
    */
   private $platform;
 
   /**
-   * @YandexYmlElement(
-   *   name = "version"
-   * )
+   * @YandexYmlElement()
    *
    * @var string
    */
   private $version;
 
   /**
-   * @YandexYmlElement(
-   *   name = "agency"
-   * )
+   * @YandexYmlElement()
    *
    * @var string
    */
   private $agency;
 
   /**
-   * @YandexYmlElement(
-   *   name = "email"
-   * )
+   * @YandexYmlElement()
    *
    * @var string
    */
   private $email;
 
   /**
-   * @YandexYmlElement(
-   *   name = "cpa"
-   * )
+   * @YandexYmlElement()
    *
    * @var int
    */
diff --git a/src/YandexYmlGenerator.php b/src/YandexYmlGenerator.php
index 95fa2fc..9842c19 100644
--- a/src/YandexYmlGenerator.php
+++ b/src/YandexYmlGenerator.php
@@ -79,7 +79,7 @@ public function __construct(Time $date_time, DateFormatter $date_formatter) {
   /**
    * Generate file on all provided data.
    */
-  public function generateFile($filename = 'products.yml', $destination_path = 'public://') {
+  public function generateFile($filename = 'products.xml', $destination_path = 'public://') {
     $this->writeHeader();
     $this->writeShopInfo();
     $this->writeCurrencies();