diff --git a/aio/content/tutorial/toh-pt0.md b/aio/content/tutorial/toh-pt0.md
index 3a944ccab7..e508ead87c 100644
--- a/aio/content/tutorial/toh-pt0.md
+++ b/aio/content/tutorial/toh-pt0.md
@@ -98,7 +98,7 @@ You'll find the implementation of the shell `AppComponent` distributed over thre
 
 1. `app.component.css`— the component's private CSS styles.
 
-   `app.component.ts`— 组件的私有 CSS 样式。
+   `app.component.css`— 组件的私有 CSS 样式。
 
 Open the component class file (`app.component.ts`) and change the value of the `title` property to 'Tour of Heroes'.