diff --git a/docs/api/ad/rewarded-video-ad.md b/docs/api/ad/rewarded-video-ad.md
index b3498c0fc962734d1e45100747e4d1031d4e4c04..7c412ad949039ccb9a518138c94bba40e1a4e155 100644
--- a/docs/api/ad/rewarded-video-ad.md
+++ b/docs/api/ad/rewarded-video-ad.md
@@ -301,7 +301,8 @@ code|message|
 ```
 
 ```
-ad.js
+// ad.js
+
 class AdHelper {
   static get instance() {
     if (this._instance == null) {