diff --git a/core/serialization.md b/core/serialization.md
index 20da77f4f2d..0acfc7077d9 100644
--- a/core/serialization.md
+++ b/core/serialization.md
@@ -579,11 +579,11 @@ namespace App\Serializer;
 use ApiPlatform\Api\IriConverterInterface;
 use App\Entity\Dummy;
 use App\Entity\RelatedDummy;
-use Symfony\Component\Serializer\Normalizer\ContextAwareDenormalizerInterface;
+use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizerAwareInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizerAwareTrait;
 
-class PlainIdentifierDenormalizer implements ContextAwareDenormalizerInterface, DenormalizerAwareInterface
+class PlainIdentifierDenormalizer implements DenormalizerInterface, DenormalizerAwareInterface
 {
     use DenormalizerAwareTrait;
 
@@ -605,6 +605,15 @@ class PlainIdentifierDenormalizer implements ContextAwareDenormalizerInterface,
     {
         return \in_array($format, ['json', 'jsonld'], true) && is_a($type, Dummy::class, true) && !empty($data['relatedDummy']) && !isset($context[__CLASS__]);
     }
+
+    public function getSupportedTypes(?string $format): array
+    {
+        return [
+            'object' => null,
+            '*' => false,
+            Dummy::class => true
+        ];
+    }
 }
 ```