diff --git a/ecs.php b/ecs.php
index d463917..af7046f 100644
--- a/ecs.php
+++ b/ecs.php
@@ -2,10 +2,12 @@
 
 declare(strict_types=1);
 
+use SlevomatCodingStandard\Sniffs\Commenting\ForbiddenAnnotationsSniff;
 use Symplify\EasyCodingStandard\Config\ECSConfig;
 
 return static function (ECSConfig $config): void {
     $config->import('vendor/sylius-labs/coding-standard/ecs.php');
+    $config->ruleWithConfiguration(ForbiddenAnnotationsSniff::class, ['forbiddenAnnotations' => ['@author', '@category', '@copyright', '@created', '@license', '@package', '@since', '@subpackage', '@version']]);
     $config->paths([
         'src', 'tests'
     ]);
diff --git a/src/Validator/CronExpression.php b/src/Validator/CronExpression.php
index 98ccd0d..54d0ecd 100644
--- a/src/Validator/CronExpression.php
+++ b/src/Validator/CronExpression.php
@@ -10,10 +10,12 @@
 /**
  * @Annotation
  *
+ * @api
+ *
  * @Target({"PROPERTY", "METHOD", "ANNOTATION"})
  */
 #[Attribute(Attribute::TARGET_PROPERTY | Attribute::TARGET_METHOD | Attribute::IS_REPEATABLE)]
-final class CronExpression extends Constraint
+class CronExpression extends Constraint
 {
     public string $message = '{{ value }} is not a valid cron expression.';
 
diff --git a/src/Validator/CronExpressionValidator.php b/src/Validator/CronExpressionValidator.php
index 41f5177..e6b498c 100644
--- a/src/Validator/CronExpressionValidator.php
+++ b/src/Validator/CronExpressionValidator.php
@@ -10,7 +10,10 @@
 use Symfony\Component\Validator\Exception\UnexpectedTypeException;
 use Symfony\Component\Validator\Exception\UnexpectedValueException;
 
-final class CronExpressionValidator extends ConstraintValidator
+/**
+ * @api
+ */
+class CronExpressionValidator extends ConstraintValidator
 {
     /**
      * @param mixed $value