diff --git a/src/DependencyInjection/CompilerPass/FixturesCompilerPass.php b/src/DependencyInjection/CompilerPass/FixturesCompilerPass.php
index 743052b..4561091 100644
--- a/src/DependencyInjection/CompilerPass/FixturesCompilerPass.php
+++ b/src/DependencyInjection/CompilerPass/FixturesCompilerPass.php
@@ -8,6 +8,7 @@
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 
+/** @internal */
 final class FixturesCompilerPass implements CompilerPassInterface
 {
     public const FIXTURE_TAG = 'doctrine.fixture.orm';
diff --git a/src/DependencyInjection/CompilerPass/PurgerFactoryCompilerPass.php b/src/DependencyInjection/CompilerPass/PurgerFactoryCompilerPass.php
index da84848..e5b2f41 100644
--- a/src/DependencyInjection/CompilerPass/PurgerFactoryCompilerPass.php
+++ b/src/DependencyInjection/CompilerPass/PurgerFactoryCompilerPass.php
@@ -11,6 +11,7 @@
 
 use function sprintf;
 
+/** @internal */
 final class PurgerFactoryCompilerPass implements CompilerPassInterface
 {
     public const PURGER_FACTORY_TAG = 'doctrine.fixtures.purger_factory';
diff --git a/src/DependencyInjection/DoctrineFixturesExtension.php b/src/DependencyInjection/DoctrineFixturesExtension.php
index 4431978..0153c4d 100644
--- a/src/DependencyInjection/DoctrineFixturesExtension.php
+++ b/src/DependencyInjection/DoctrineFixturesExtension.php
@@ -13,6 +13,7 @@
 
 use function dirname;
 
+/** @internal */
 final class DoctrineFixturesExtension extends Extension
 {
     /**