diff --git a/lib/src/media_recorder.dart b/lib/src/media_recorder.dart
index 0f51849..a2bd668 100644
--- a/lib/src/media_recorder.dart
+++ b/lib/src/media_recorder.dart
@@ -3,13 +3,22 @@ import 'media_stream.dart';
 import 'media_stream_track.dart';
 
 abstract class MediaRecorder {
-  /// For Android use audioChannel param
-  /// For iOS use audioTrack
+  /// Starts recording to file at [path].
+  /// Optionally, on Android choose [audioChannel] to record.
+  /// Optionally, on iOS/OSX set [audioTrack] to record. Only remote audio
+  /// tracks are supported!
+  /// Optionally, [rotationDegrees] allows to rotate resulting video.
+  /// On web platform use [startWeb] instead.
   Future<void> start(
     String path, {
     MediaStreamTrack? videoTrack,
     RecorderAudioChannel? audioChannel,
+    MediaStreamTrack? audioTrack,
+    int rotationDegrees = 0,
   });
+  
+  /// Changes current video track
+  Future<void> changeVideoTrack(MediaStreamTrack videoTrack);
 
   /// Only for Flutter Web
   void startWeb(