diff --git a/DependencyInjection/Compiler/AddDescribersPass.php b/DependencyInjection/Compiler/AddDescribersPass.php
index ff7173d..0849b1c 100644
--- a/DependencyInjection/Compiler/AddDescribersPass.php
+++ b/DependencyInjection/Compiler/AddDescribersPass.php
@@ -14,7 +14,10 @@ namespace Nelmio\ApiDocBundle\DependencyInjection\Compiler;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
-class AddDescribersPass implements CompilerPassInterface
+/**
+ * @internal
+ */
+final class AddDescribersPass implements CompilerPassInterface
 {
     use PriorityTaggedServiceTrait;
 
diff --git a/DependencyInjection/Compiler/AddRouteDescribersPass.php b/DependencyInjection/Compiler/AddRouteDescribersPass.php
index 64ddde3..35e0867 100644
--- a/DependencyInjection/Compiler/AddRouteDescribersPass.php
+++ b/DependencyInjection/Compiler/AddRouteDescribersPass.php
@@ -14,7 +14,10 @@ namespace Nelmio\ApiDocBundle\DependencyInjection\Compiler;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
-class AddRouteDescribersPass implements CompilerPassInterface
+/**
+ * @internal
+ */
+final class AddRouteDescribersPass implements CompilerPassInterface
 {
     use PriorityTaggedServiceTrait;