diff --git a/serial/t.c b/serial/t.c
index 02a73c9..f56318b 100644
--- a/serial/t.c
+++ b/serial/t.c
@@ -51,6 +51,14 @@ for (count=0; count<iters; count++) {
 return 0;
 }
 /* ---------------------------------------------------------------- */
+void help(int k)
+{
+puts("options : ");
+puts("\t-d\tserial device to read.");
+puts("\t-n\tnumber of records to grab.");
+puts("\t-v\tincrease verbosity.");
+}
+/* ---------------------------------------------------------------- */
 int main (int argc, char *argv[])
 {
 int		serial_in;
@@ -62,12 +70,12 @@ verbosity	= 0;
 nbre		= 25;
 speed		= 9600;
 
-while ((opt = getopt(argc, argv, "d:n:v")) != -1) {
+while ((opt = getopt(argc, argv, "d:n:vh")) != -1) {
 	switch (opt) {
 		case 'v':	verbosity++;		break;
 		case 'n':	nbre = atoi(optarg);	break;
 		case 'd':	device = optarg;	break;
-
+		case 'h':	help(0);		exit(0);
 		default:
 			fprintf(stderr, "%s : uh ?", argv[0]);
 			exit(1);