-U: add [-l] [-f] [-v] path1 ...
-H: Each given path may be either the full path to an audio file, or the full path
-H: of a directory. In case of a directory, all audio files in that directory
-H: are added recursively.
+U: add [-l] [-f] [-v] path...
+H: Each given path may be either the full path to an audio
+H: file, or the full path of a directory. In case of a
+H: directory, all audio files in that directory are added
+H: recursively. Only absolute paths are accepted.