--- a/doc/upmpdcli-manual.txt
+++ b/doc/upmpdcli-manual.txt
@@ -292,7 +292,7 @@
 album art).
 
 If set, +artScript+ is the path to an executable script which can retrieve
-the image for the currently playing title.
+the image URL for the currently playing title.
 
 Some radios (e.g.  link:https://www.radioparadise.com/rp_2.php?#[Radio
 Paradise]) publish the album art for the currently playing title. The
@@ -355,8 +355,10 @@
 songs.each do |song|
   song_end = Time.at(song['end'])
   if (song['embedType'] == 'song' && song_end >= now && Time.at(song['start']) <= now)
-    metadata = {'title' => song['title'].split.collect{|s| s.capitalize}.join(' '),
-               'artist' => song['performers'].split.collect{|s| s.capitalize}.join(' '),
+    title = song['title'] ? song['title'] : ''
+    artist = song['performers'] ? song['performers'] : song['authors']
+    metadata = {'title' => title.split.collect{|s| s.capitalize}.join(' '),
+               'artist' => artist.split.collect{|s| s.capitalize}.join(' '),
                'artUrl' => song['visual'],
                'reload' => (song_end - now + 1).to_i}
     puts JSON.generate(metadata)
@@ -395,14 +397,16 @@
 Upmpdcli Senders and Receivers can be mixed with Linn ones and controlled
 from Upplay or Bubble DS (an maybe other control points).
 
-Upmpdcli Senders can't be used by Linn Kazoo (tested with release
-4.11.226), the reason unknown, but neither Linn nor upmpdcli receivers can
-be linked to an upmpdcli Sender using Kazoo.
+Neither Linn nor upmpdcli receivers can be linked to an upmpdcli Sender using 
+Linn Kazoo (tested with release 4.11.226), the reason is unknown.
 
 Upmpdcli Receivers before release 1.2.14 are not visible in Linn
 Kazoo. Later versions can be linked, and stream, from a Linn Sender.
 
-
+Linn Kazoo can control the playlist in an upmpdcli instance which has been
+put in Sender mode by another CP (i.e. currently using the PL-To-Sender
+source). The Lumin IOS app will reset the Source to Playlist when
+connecting, so it is unusable in this context.
 
 [[UPMPDCLI-RECEIVER]]
 === Upmpdcli Songcast Receiver