diff --git a/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/InputService.kt b/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/InputService.kt
index fa6a348c1..2db376230 100644
--- a/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/InputService.kt
+++ b/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/InputService.kt
@@ -1,5 +1,11 @@
 package com.carriez.flutter_hbb
 
+/**
+ * Handle remote input and dispatch android gesture
+ *
+ * Inspired by [droidVNC-NG] https://github.com/bk138/droidVNC-NG
+ */
+
 import android.accessibilityservice.AccessibilityService
 import android.accessibilityservice.GestureDescription
 import android.content.Context
diff --git a/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainActivity.kt b/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainActivity.kt
index bb4e85c89..3cc105bfa 100644
--- a/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainActivity.kt
+++ b/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainActivity.kt
@@ -1,5 +1,12 @@
 package com.carriez.flutter_hbb
 
+/**
+ * Handle events from flutter
+ * Request MediaProjection permission
+ *
+ * Inspired by [droidVNC-NG] https://github.com/bk138/droidVNC-NG
+ */
+
 import android.app.Activity
 import android.content.ComponentName
 import android.content.Context
diff --git a/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainService.kt b/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainService.kt
index dc86cea45..a71541cd8 100644
--- a/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainService.kt
+++ b/flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainService.kt
@@ -1,8 +1,11 @@
+package com.carriez.flutter_hbb
+
 /**
  * Capture screen,get video and audio,send to rust.
- * Handle notification
+ * Dispatch notifications
+ *
+ * Inspired by [droidVNC-NG] https://github.com/bk138/droidVNC-NG
  */
-package com.carriez.flutter_hbb
 
 import android.Manifest
 import android.annotation.SuppressLint