diff --git a/articles/mobile-apps/includes/notification-hubs-backend-service-web-api.md b/articles/mobile-apps/includes/notification-hubs-backend-service-web-api.md
index 23d9a0a23f..b6440b0ea8 100644
--- a/articles/mobile-apps/includes/notification-hubs-backend-service-web-api.md
+++ b/articles/mobile-apps/includes/notification-hubs-backend-service-web-api.md
@@ -510,6 +510,10 @@ Use of the notification hub and the [Notification Hubs SDK for backend operation
 1. In **Startup.cs**, update the **ConfigureServices** method to add the **NotificationHubsService** as a singleton implementation of **INotificationService**.
 
     ```csharp
+    
+    using PushDemoApi.Models;
+    using PushDemoApi.Services;
+
     public void ConfigureServices(IServiceCollection services)
     {
         ...