Update README.md

Author: zxcpoiu

README.md

@@ -241,7 +241,7 @@ note: ios only supports `auto` currently.
 | setKeepScreenOn(`enable: ?boolean`)   | :smile: | :smile: | set KeepScreenOn flag = true or false</br>default: false |
 | setSpeakerphoneOn(`enable: ?boolean`)   | :smile: | :rage: | toggle speaker ON/OFF once. but not force</br>default: false |
 | setForceSpeakerphoneOn(`flag: ?boolean`)   | :smile: | :smile: | true -> force speaker on</br> false -> force speaker off</br> null -> use default behavior according to media type</br>default: null |
-| setMicrophoneMute(`enable: ?boolean`)   | :smile: | :rage: | mute/unmute micophone</br>default: false |
+| setMicrophoneMute(`enable: ?boolean`)   | :smile: | :rage: | mute/unmute micophone</br>default: false</br>p.s. if you use webrtc, you can just use `track.enabled = false` to mute |
 | async checkRecordPermission()   | :smile: | :smile: | check record permission without promt. return Promise. see **about permission** section above |
 | async requestRecordPermission()   | :smile: | :smile: | request record permission to user. return Promise. see **about permission** section above |