added note about intellisense not appearing

Author: tfitzmac

articles/azure-resource-manager/bicep/quickstart-create-bicep-use-visual-studio-code.md

@@ -1,7 +1,7 @@
 ---
 title: Create Bicep files - Visual Studio Code
 description: Use Visual Studio Code and the Bicep extension to Bicep files for deploy Azure resources
-ms.date: 07/30/2021
+ms.date: 10/01/2021
 ms.topic: quickstart
 ms.custom: devx-track-azurepowershell
 
@@ -29,6 +29,9 @@ In *main.bicep*, type **vnet**. Select **res-vnet** from the list, and then Tab
 
 :::image type="content" source="./media/quickstart-create-bicep-use-visual-studio-code/add-snippet.png" alt-text="Add snippet for virtual network":::
 
+> [!TIP]
+> If you don't see those intellisense options in VS Code, make sure you've installed the Bicep extension as specified in [Prerequisites](#prerequisites). If you have installed the extension, give the Bicep language service some time to start after opening your Bicep file. It usually starts quickly, but you will not have intellisense options until it starts. A notification in the lower right corner indicate that the service is starting.
+
 Your Bicep file now contains the following code:
 
 ```bicep