diff --git a/headers/rtc_4.3.1.136/custom_headers/CustomIAgoraMediaPlayer.h b/headers/rtc_4.3.1.136/custom_headers/CustomIAgoraMediaPlayer.h
index 055f6cc..82b8f4a 100644
--- a/headers/rtc_4.3.1.136/custom_headers/CustomIAgoraMediaPlayer.h
+++ b/headers/rtc_4.3.1.136/custom_headers/CustomIAgoraMediaPlayer.h
@@ -6,12 +6,14 @@
 
 namespace agora {
 namespace rtc {
-namespace ext {
 
+// Put this class to the agora::rtc namespaces to avoid unecessary namespace trimming(trim the `ext` namespace).
 class IMediaPlayerVideoFrameObserver {
   virtual void onFrame(const agora::media::base::VideoFrame *frame) = 0;
 };
 
+namespace ext {
+  
 class IMediaPlayer {
   // ----------------------------- 👇🏻overload API👇🏻 -----------------------------