diff --git a/readme.md b/readme.md
index 4dbdb202..db18cb14 100644
--- a/readme.md
+++ b/readme.md
@@ -1346,7 +1346,7 @@ Fulfillments can only be cancelled if their `Status` is `pending`.
 
 ```cs
 var service = new FulfillmentService(myShopifyUrl, shopAccessToken);
-await service.CancelAsync(orderId, fulfillmentId);
+await service.CancelAsync(fulfillmentId)
 ```
 
 ---