diff --git a/ubb-patgen/ubb-patgen.c b/ubb-patgen/ubb-patgen.c
index 618f545..22bb5d1 100644
--- a/ubb-patgen/ubb-patgen.c
+++ b/ubb-patgen/ubb-patgen.c
@@ -443,12 +443,11 @@ static void usage(const char *name)
 {
         fprintf(stderr,
 "usage: %s\n"
-"       %s [-b freq_hz] [-f freq_hz] -c [-q] [active_s]\n"
-"       %s [-b freq_hz] [-f freq_hz] [-C] [-q] pattern\n\n"
-"  -b freq_hz  set bus clock to the specified frequency (default: 1 MHz)\n"
+"       %s [-f freq_hz] -c [-q] [active_s]\n"
+"       %s [-f freq_hz] [-C] [-q] pattern\n\n"
 "  -c          output bus clock on CLK without sending a pattern\n"
 "  -C          temporarily output bus clock on CLK (for debugging)\n"
-"  -f freq_hz  set pattern rate (default: same as bus clock)\n"
+"  -f freq_hz  set bus clock to the specified frequency (default: 1 MHz)\n"
 "  -q          quiet. Don't report clock differences.\n\n"
 "  active_s    keep running that many seconds after setting the clock\n"
 "              (default: exit immediately but leave the clock on)\n"
@@ -468,7 +467,6 @@ int main(int argc, char **argv)
 {
 	struct mmcclk clk;
 	int bus_hz = 0, clk_only = 0, clkout = 0, bus_rel = 0;
-	int pattern_hz = 0, pattern_rel = 0;
 	const char *pattern = NULL;
 	int quiet = 0;
 	double active_s = 0;
@@ -477,14 +475,10 @@ int main(int argc, char **argv)
 	char *end;
 	int c;
 
-	while ((c = getopt(argc, argv, "b:cCq")) != EOF)
+	while ((c = getopt(argc, argv, "cCf:q")) != EOF)
 		switch (c) {
-		case 'b':
-			if (!frequency(optarg, &bus_hz, &bus_rel))
-				usage(*argv);
-			break;
 		case 'f':
-			if (!frequency(optarg, &pattern_hz, &pattern_rel))
+			if (!frequency(optarg, &bus_hz, &bus_rel))
 				usage(*argv);
 			break;
 		case 'c':
@@ -504,7 +498,7 @@ int main(int argc, char **argv)
 	case 0:
 		if (clk_only)
 			break;
-		if (bus_hz || pattern_hz || clkout || quiet)
+		if (bus_hz || clkout || quiet)
 			usage(*argv);
 		ubb_open(UBB_ALL);
 		show_frequencies();