diff --git a/core/validation.md b/core/validation.md
index 70ccad8bc1c..8f4c1f47120 100644
--- a/core/validation.md
+++ b/core/validation.md
@@ -208,7 +208,7 @@ use ApiPlatform\Metadata\ApiResource;
 use Symfony\Component\Validator\Constraints as Assert;
 
 #[ApiResource(
-    validationContext: ['groups' => [Book::class, 'validationGroups']
+    validationContext: ['groups' => [Book::class, 'validationGroups']]
 )]
 class Book
 {