diff --git a/docs/mouse-events-have-key-events.md b/docs/mouse-events-have-key-events.md
index 8334897f..c44289ac 100644
--- a/docs/mouse-events-have-key-events.md
+++ b/docs/mouse-events-have-key-events.md
@@ -8,7 +8,7 @@ This rule takes no arguments.
 
 ### Succeed
 
-```
+```vue
 <div @mouseover="foo" @focus="bar" />
 <div @mouseout="foo" @blur="bar" />
 ```