diff --git a/Render/Html/GetNelmioAsset.php b/Render/Html/GetNelmioAsset.php
index 38e85a6..a312899 100644
--- a/Render/Html/GetNelmioAsset.php
+++ b/Render/Html/GetNelmioAsset.php
@@ -14,6 +14,9 @@ namespace Nelmio\ApiDocBundle\Render\Html;
 use Symfony\Bridge\Twig\Extension\AssetExtension;
 use Twig\TwigFunction;
 
+/**
+ * @internal
+ */
 class GetNelmioAsset
 {
     private $assetExtension;
diff --git a/Render/Html/HtmlOpenApiRenderer.php b/Render/Html/HtmlOpenApiRenderer.php
index 88cb7d1..78577f1 100644
--- a/Render/Html/HtmlOpenApiRenderer.php
+++ b/Render/Html/HtmlOpenApiRenderer.php
@@ -17,6 +17,9 @@ use Nelmio\ApiDocBundle\Render\RenderOpenApi;
 use OpenApi\Annotations\OpenApi;
 use Twig\Environment;
 
+/**
+ * @internal
+ */
 class HtmlOpenApiRenderer implements OpenApiRenderer
 {
     /** @var Environment|\Twig_Environment */
diff --git a/Render/Json/JsonOpenApiRenderer.php b/Render/Json/JsonOpenApiRenderer.php
index 09af9e1..62b0a7f 100644
--- a/Render/Json/JsonOpenApiRenderer.php
+++ b/Render/Json/JsonOpenApiRenderer.php
@@ -15,6 +15,9 @@ use Nelmio\ApiDocBundle\Render\OpenApiRenderer;
 use Nelmio\ApiDocBundle\Render\RenderOpenApi;
 use OpenApi\Annotations\OpenApi;
 
+/**
+ * @internal
+ */
 class JsonOpenApiRenderer implements OpenApiRenderer
 {
     public function getFormat(): string
diff --git a/Render/OpenApiRenderer.php b/Render/OpenApiRenderer.php
index 5a672c4..73edb66 100644
--- a/Render/OpenApiRenderer.php
+++ b/Render/OpenApiRenderer.php
@@ -13,6 +13,9 @@ namespace Nelmio\ApiDocBundle\Render;
 
 use OpenApi\Annotations\OpenApi;
 
+/**
+ * @internal
+ */
 interface OpenApiRenderer
 {
     public function getFormat(): string;
diff --git a/Render/Yaml/YamlOpenApiRenderer.php b/Render/Yaml/YamlOpenApiRenderer.php
index a8e7c5d..b96a284 100644
--- a/Render/Yaml/YamlOpenApiRenderer.php
+++ b/Render/Yaml/YamlOpenApiRenderer.php
@@ -15,6 +15,9 @@ use Nelmio\ApiDocBundle\Render\OpenApiRenderer;
 use Nelmio\ApiDocBundle\Render\RenderOpenApi;
 use OpenApi\Annotations\OpenApi;
 
+/**
+ * @internal
+ */
 class YamlOpenApiRenderer implements OpenApiRenderer
 {
     public function getFormat(): string