diff --git a/plugins/ubuntu/ubuntu.plugin.zsh b/plugins/ubuntu/ubuntu.plugin.zsh
index a1fb51a19..e78ba1f81 100644
--- a/plugins/ubuntu/ubuntu.plugin.zsh
+++ b/plugins/ubuntu/ubuntu.plugin.zsh
@@ -143,6 +143,8 @@ function apt-list-packages {
     awk '{print $1" "$2}'
 }
 
+# Spotify client control commands
+# Based on: https://gist.github.com/wandernauta/6800547
 function spotify-ctl {
   ## CONSTANTS ##
   SP_DEST="org.mpris.MediaPlayer2.spotify"