anchor.diff:      services.mpd = {
   
         enable = mkOption {
  +        type = types.bool;
           default = false;
           description = ''
             Whether to enable MPD, the music player daemon.
  
positive.code:         };
  
          port = mkOption {
            default = 6600;
            description = ''
              This setting is the TCP port that is desired for the daemon to get assigned
  
negative.code:       };
  
        user = mkOption {
          type = types.str;
          default = "mpd";
          description = "User account under which MPD runs.";
        };
  
        group = mkOption {
          type = types.str;
          default = "mpd";
          description = "Group account under which MPD runs.";
        };
  