diff --git a/usr.sbin/bhyve/bhyverun.c b/usr.sbin/bhyve/bhyverun.c
--- a/usr.sbin/bhyve/bhyverun.c
+++ b/usr.sbin/bhyve/bhyverun.c
@@ -238,7 +238,7 @@
 		"       -k: key=value flat config file\n"
 		"       -K: PS2 keyboard layout\n"
 		"       -l: LPC device configuration\n"
-		"       -m: memory size in MB\n"
+		"       -m: memory size\n"
 		"       -o: set config 'var' to 'value'\n"
 		"       -P: vmexit from the guest on pause\n"
 		"       -p: pin 'vcpu' to 'hostcpu'\n"