diff --git a/src/Annotate/ContentType.php b/src/Annotate/ContentType.php
index 339551d..7cb0a40 100644
--- a/src/Annotate/ContentType.php
+++ b/src/Annotate/ContentType.php
@@ -2,7 +2,7 @@
 
 namespace Kiri\Router\Annotate;
 
-#[\Attribute]
+#[\Attribute(((\Attribute::TARGET_METHOD)))]
 class ContentType
 {