diff --git a/README.md b/README.md
index c6b2d8455..54a39e05b 100755
--- a/README.md
+++ b/README.md
@@ -92,7 +92,7 @@ Supported operating systems and hardware:
15. Support broadcast by forward the stream to other servers(origin/edge).
16. Support live stream transcoding by ffmpeg.
17. Support live stream forward(acopy/vcopy) by ffmpeg.
-18. Support ffmpeg filters(logo/overlay/crop), x264 params.
+18. Support ffmpeg filters(logo/overlay/crop), x264 params, copy/vn/an.
19. Support audio transcode only, speex/mp3 to aac
20. Support [http callback api hooks](https://github.com/winlinvip/simple-rtmp-server/wiki/HTTPCallback)(for authentication and injection).
21. Support bandwidth test api and flash client.