Update README.md

spotify-widget/README.md

@@ -1,11 +1,22 @@
 # Spotify widget
 
-This widget displays currently playing song on [Spotify for Linux](https://www.spotify.com/download/linux/) client: ![screenshot](./spo-wid-1.png).
+This widget displays currently playing song on [Spotify for Linux](https://www.spotify.com/download/linux/) client: ![screenshot](./spo-wid-1.png) and consists of two parts: 
 
-If clicked plays/pauses the music.
+ - status icon which shows if music is currently playing
+ - artist and name of the current song playing
+
+## Controls
+
+ - left click - play/pause
+ - scroll up - play next song
+ - scroll down - play previous song
+
+## Dependencies
 
 Note that widget uses the Arc icon theme, so it should be [installed](https://github.com/horst3180/arc-icon-theme#installation) first under **/usr/share/icons/Arc/** folder.
 
+Also this widget uses the output of the **spotify_stat** script which could be found in the widget folder.
+
 ## Installation
 
 First you need to have spotify CLI installed. Here is how you can do it (except widget part): [pavelmakhov.com/2016/02/awesome-wm-spotify](http://pavelmakhov.com/2016/02/awesome-wm-spotify) 
@@ -22,3 +33,10 @@ s.mytasklist, -- Middle widget
         spotify_widget,
 		...      
 ```
+
+## Troubleshooting
+
+_Status icon (play/pause) is not shown_:
+ - make **spotify_stat** script executable (by `sudo chmod +x spotify_stat`) and run it in terminal, output should be either `RUNNING` or `CORKED`;
+ - the **spotify_stat** script is called by **spotify.lua** so make sure that `get_spotify_status_cmd` in **spotify.lua** contains the right path to the script;
+ - create an issue :octocat:.