diff --git a/ui/cmddb.c b/ui/cmddb.c
index 4eb5ca7..edf5740 100644
--- a/ui/cmddb.c
+++ b/ui/cmddb.c
@@ -190,11 +190,12 @@ const struct cmddb_record commands[] = {
 		.func = cmd_erase,
 		.help =
 "erase [all|segment] [address]\n"
-"erase segrange <address> <size> <seg-size>\n"
+"erase segrange <address> <total-size> <seg-size>\n"
 "    Erase the device under test. With no arguments, erases all of main\n"
 "    memory. Specify arguments to perform a mass erase, or to erase\n"
 "    individual segments. The \"segrange\" mode is used to erase an\n"
-"    address range via a series of segment erases.\n"
+"    address range via a series of segment erases, 'total-size' being"
+"    a multiple of 'seg-size'.\n"
 	},
 	{
 		.name = "step",