hdmi sound issue (comment describing why the commented lines are there)

busunit/rootfs/etc/rc.local

@@ -35,6 +35,7 @@ sleep 2
 /home/bus/bin/reset-gps 2>&1 >> /tmp/gps.log &
 sleep 2
 
+## If using HDMI sound, uncomment the following two lines...
 #vcgencmd force_audio hdmi 1 2>&1 >> /tmp/audio.log &
 #sleep 1