diff --git a/src/guide/essentials/component-basics.md b/src/guide/essentials/component-basics.md
index a7342e7898..651a5f8d9c 100644
--- a/src/guide/essentials/component-basics.md
+++ b/src/guide/essentials/component-basics.md
@@ -468,7 +468,7 @@ Something bad happened.
 
 This can be achieved using Vue's custom `<slot>` element:
 
-```vue{4}
+```vue{5}
 <!-- AlertBox.vue -->
 <template>
   <div class="alert-box">