diff --git a/src/Reflection/ClassConstantReflection.php b/src/Reflection/ClassConstantReflection.php
index 75ed3e0359..fd69ce8129 100644
--- a/src/Reflection/ClassConstantReflection.php
+++ b/src/Reflection/ClassConstantReflection.php
@@ -10,6 +10,7 @@
 use PHPStan\Type\TypehintHelper;
 use const NAN;
 
+/** @api */
 class ClassConstantReflection implements ConstantReflection
 {