diff --git a/03. 專注Study/Android/AudioTrack.md b/03. 專注Study/Android/AudioTrack.md
index e65d9e7..9058eab 100644
--- a/03. 專注Study/Android/AudioTrack.md	
+++ b/03. 專注Study/Android/AudioTrack.md	
@@ -52,6 +52,7 @@ audioTrack?.play()
 使用 `release()` 來結束資源。
 
 ## 參考
+- [AudioTrack](https://developer.android.com/reference/android/media/AudioTrack)
 - [音视频开发之旅（三）AudioTrack播放PCM音频](https://zhuanlan.zhihu.com/p/265804902)
 - [深入剖析Android音頻之AudioTrack](https://blog.csdn.net/yangwen123/article/details/39989751)
 - [Android音频开发之AudioTrack](https://www.jianshu.com/p/c67fd0c2b379)
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