Kersten Richter: Update subscription-cos-tutorial.md

subscription-cos-tutorial.md

@@ -2,7 +2,7 @@
 
 copyright:
   years: 2021
-lastupdated: "2021-03-29"
+lastupdated: "2021-03-30"
 
 keywords: tutorial code engine, tutorial cloud object storage for code engine, tutorial cloud object storage, subscribing cloud object storage, subscribing cloud object storage for code engine
 
@@ -345,6 +345,8 @@ After the subscription is created, but before the `subscription cos create` comm
 
 For more information about headers and body, see [HTTP headers and body information for events](/docs/codeengine?topic=codeengine-subscribing-events#sub-header-body).
 
+Note that subscriptions can affect how an application scales. For more information, see [Configuring application scaling](/docs/codeengine?topic=codeengine-app-scale).
+
 
 ## Update your {{site.data.keyword.cos_short}} subscription
 {: #update-subscription-cos}