Update README.md

README.md

@@ -1,13 +1,15 @@
 # to_opus
-converting all Files in your current working directory and all subdirectories to opus. This is work in progress
+converting all Files with given file extension in your current working directory and all subdirectories to opus.
+Executed on videofiles it will make a copy of the audiostream(s) and convert them to opus. The original file remains unaffected.
+
+This script is work in progress and in a early state.
 
 ### Example
-```bash to_opus mp3 flac``` convert all files with .mp3-extension and .flac-extension to opus
+convert all files with .mp3-extension and .flac-extension to opus
+```bash to_opus mp3 flac```
 
 ### Dependencies
 - ffmpeg
 
 ## ToDo:
-- better support multiple audio streams
 - better documentation
-- support for converting the audiostream in video files