diff --git a/rules/DowngradePhp80/Rector/FuncCall/DowngradeSubstrFalsyRector.php b/rules/DowngradePhp80/Rector/FuncCall/DowngradeSubstrFalsyRector.php
index 1f421208..4678d903 100644
--- a/rules/DowngradePhp80/Rector/FuncCall/DowngradeSubstrFalsyRector.php
+++ b/rules/DowngradePhp80/Rector/FuncCall/DowngradeSubstrFalsyRector.php
@@ -178,6 +178,7 @@ public function refactor(Node $node): ?Node
             }
         }
 
+        // @phpstan-ignore rector.rectorCheaperGuardsFirst (cannot hoist above the CallLike block, which marks IS_FALSY_UNCASTABLE on non-substr nodes)
         if (! $this->isName($node, 'substr')) {
             return null;
         }