diff --git a/src/ttynvt.c b/src/ttynvt.c
index 3938675..14866be 100644
--- a/src/ttynvt.c
+++ b/src/ttynvt.c
@@ -1115,6 +1115,8 @@ static void print_help(void)
 {
     fprintf(stderr, "ttynvt Usage:\n"
             "\t-D level\tEnable debug\n"
+            "\t-d\t\tStay in foreground, do not detach\n"
+            "\t-f\t\tStay in foreground, do not detach\n"
             "\t-E\t\tPrint debug to stdout (default is syslog)\n"
             "\t-M major, --maj=major\n"
             "\t-m minor, --min=minor\n"