1 files changed, 5 insertions, 0 deletions
diff --git a/args.go b/args.go
index d0f5da9..2adb076 100644
--- a/args.go
+++ b/args.go
@@ -16,6 +16,7 @@ type args struct {
 	FullMap        bool
 	ExactMTCLarge  bool
 	TotativeDigits bool
+	DigitMapOnly   bool
 	// If true, exit the program immediately after parsing args.
 	Exit bool
 }
@@ -23,6 +24,8 @@ type args struct {
 func parseArgs() (args, error) {
 	var a args
 	flag.BoolVar(&a.Compact, "c", false, "Compact the output display")
+	flag.BoolVar(&a.DigitMapOnly, "d", false,
+		"Show only the digit map; incompatible with -m and -t")
 	flag.BoolVar(&a.FullMap, "f", false,
 		fmt.Sprintf("Show full digit map (up to %d) for every radix",
 			maxSmallRadix))
@@ -45,6 +48,8 @@ func parseArgs() (args, error) {
 		return args{Exit: true}, nil
 	} else if a.Compact && a.TotativeDigits {
 		return args{}, errors.New("You cannot use both -t and -c at the same time.")
+	} else if a.DigitMapOnly && (a.TotativeDigits || a.ExactMTCLarge) {
+		return args{}, errors.New("You cannot use both -d and -t or -m at the same time.")
 	} else {
 		if flag.NArg() == 1 {
 			if radix, err := strconv.ParseUint(flag.Arg(0), 0, 0); err == nil {