Merge pull request #175603 from bengimblett/patch-4

Update add-api-manually.md

Author: PRMerger3

articles/api-management/add-api-manually.md

@@ -9,6 +9,7 @@ ms.service: api-management
 ms.topic: tutorial
 ms.date: 04/26/2021
 ms.author: danlep
+ms.custom: fasttrack-edit
 
 ---
 
@@ -107,6 +108,9 @@ Test the operation in the Azure portal.  Alternatively, you can test it in the *
 1. Press **Send**.
 
     The response that the "http://httpbin.org/headers" operation generates appears. If you want to transform your operations, see [Transform and protect your API](transform-api.md).
+  
+>[!NOTE] 
+> It can be important to understand how the host for the backend API you are integrating with handles trailing slashes on an operation URL. For more information, please see this [API Management FAQ](./api-management-faq.yml#how-does-api-management-handle-trailing-slashes-when-calling-backend-services-).
 
 [!INCLUDE [api-management-navigate-to-instance.md](../../includes/api-management-append-apis.md)]