diff --git a/Models/Product.php b/Models/Product.php
index 560bab7..70b5e7e 100644
--- a/Models/Product.php
+++ b/Models/Product.php
@@ -104,6 +104,11 @@ public function isOnStock(): bool
         return $this->stock > 0;
     }
 
+    public function isOutOfStock(): bool
+    {
+        return !$this->isOnStock();
+    }
+
     public function onStockQuantity(): float
     {
         return (float) $this->stock;