diff --git a/docs/guide/essentials/es-modules.md b/docs/guide/essentials/es-modules.md
index d14ce733..83f31047 100644
--- a/docs/guide/essentials/es-modules.md
+++ b/docs/guide/essentials/es-modules.md
@@ -20,7 +20,7 @@ In your background script, set `type: "module"`:
 
 ```ts
 export default defineBackground({
-  type: 'module', // !code ++
+  type: 'module', // [!code ++]
   main() {
     // ...
   },