diff --git a/tests/PHPStan/Rules/Methods/data/bug-13556.php b/tests/PHPStan/Rules/Methods/data/bug-13556.php
index c753e51b48..6b3d371989 100644
--- a/tests/PHPStan/Rules/Methods/data/bug-13556.php
+++ b/tests/PHPStan/Rules/Methods/data/bug-13556.php
@@ -1,5 +1,7 @@
 <?php
 
+// intentional in global namespace to make the class-name conflict with a samed named class from a PHP extension
+
 class event {
 	public static function add($_event, $_option = []) {
 		// $_option est optionnel avec valeur par défaut