diff --git a/aio/content/examples/toh-pt4/src/app/app.module.ts b/aio/content/examples/toh-pt4/src/app/app.module.ts
index 70b26976da..f3cc34faff 100644
--- a/aio/content/examples/toh-pt4/src/app/app.module.ts
+++ b/aio/content/examples/toh-pt4/src/app/app.module.ts
@@ -21,7 +21,14 @@ import { MessagesComponent } from './messages/messages.component';
     FormsModule
   ],
   // #docregion providers
-  providers: [ HeroService, MessageService ],
+  // #docregion providers-heroservice
+  providers: [
+    HeroService,
+    // #enddocregion providers-heroservice
+    MessageService
+    // #docregion providers-heroservice
+  ],
+  // #enddocregion providers-heroservice
   // #enddocregion providers
   bootstrap: [ AppComponent ]
 })
diff --git a/aio/content/tutorial/toh-pt4.md b/aio/content/tutorial/toh-pt4.md
index 807f886f31..241e50799f 100644
--- a/aio/content/tutorial/toh-pt4.md
+++ b/aio/content/tutorial/toh-pt4.md
@@ -97,7 +97,7 @@ Since you did not, you'll have to provide it yourself.
 
 Open the `AppModule` class, import the `HeroService`, and add it to the `@NgModule.providers` array.
 
-<code-example path="toh-pt4/src/app/app.module.ts" linenums="false" title="src/app/app.module.ts (providers)" region="providers">
+<code-example path="toh-pt4/src/app/app.module.ts" linenums="false" title="src/app/app.module.ts (providers)" region="providers-heroservice">
 </code-example>
 
 The `providers` array tells Angular to create a single, shared instance of `HeroService`
@@ -105,6 +105,12 @@ and inject into any class that asks for it.
 
 The `HeroService` is now ready to plug into the `HeroesComponent`.
 
+<div class="alert is-important">
+
+This is a interim code sample that will allow you to provide and use the `HeroService`.  At this point, the code will differ from the `HeroService` in the ["final code review"](#final-code-review).
+
+</div>
+
 <div class="alert is-helpful">
 
   Learn more about _providers_ in the [Providers](guide/providers) guide.
@@ -423,6 +429,10 @@ Here are the code files discussed on this page and your app should look like thi
   path="toh-pt4/src/app/messages/messages.component.css">
   </code-pane>
 
+  <code-pane title="src/app/app.module.ts"
+  path="toh-pt4/src/app/app.module.ts">
+  </code-pane>
+
   <code-pane title="src/app/app.component.html"
   path="toh-pt4/src/app/app.component.html">
   </code-pane>