anchor.diff:  
         dev = mkOption {
           default = null;
  -	example = "/dev/input/event0";
  +        example = "/dev/input/event0";
           description =
             ''
               Path for touchpad device.  Set to null to apply to any
  
positive.code:           Option "VertTwoFingerScroll" "${if cfg.twoFingerScroll then "1" else "0"}"
            Option "HorizTwoFingerScroll" "${if cfg.twoFingerScroll then "1" else "0"}"
            Option "VertEdgeScroll" "${if cfg.vertEdgeScroll then "1" else "0"}"
          EndSection
        '';
  
  
negative.code:       vertEdgeScroll = mkOption {
          default = ! cfg.twoFingerScroll;
          description = "Whether to enable vertical edge drag-scrolling.";
        };
  
        additionalOptions = mkOption {
          default = "";
          example = ''
            Option "RTCornerButton" "2"
            Option "RBCornerButton" "3"
  		'';
          description = ''
            Additional options for synaptics touchpad driver.
          '';
        };
  
      };
  