(forumsteam) fixes MicrosoftDocs/azure-docs#49147

Added a note about the 4,000 character limit for docker compose apps.

Author: BryanTrach-MSFT

articles/app-service/containers/quickstart-multi-container.md

@@ -93,6 +93,9 @@ When the App Service plan has been created, the Azure CLI shows information simi
 
 ## Create a Docker Compose app
 
+> [!NOTE]
+> Docker Compose on Azure App Services currently has a limit of 4,000 characters at this time.
+
 In your Cloud Shell terminal, create a multi-container [web app](app-service-linux-intro.md) in the `myAppServicePlan` App Service plan with the [az webapp create](/cli/azure/webapp?view=azure-cli-latest#az-webapp-create) command. Don't forget to replace _\<app_name>_ with a unique app name (valid characters are `a-z`, `0-9`, and `-`).
 
 ```azurecli