diff --git a/es_print_libusb.c b/es_print_libusb.c
index fffe632..17ce5da 100644
--- a/es_print_libusb.c
+++ b/es_print_libusb.c
@@ -151,7 +151,7 @@ int main (int argc, char **argv)
 	
 	/* Cmdline help */
 	if (argc < 2) {
-		fprintf(stderr, "SELPHY ES Print Assist version %s\n\nUsage:\n\t%s infile\n",
+		fprintf(stderr, "SELPHY Print Assist version %s\n\nUsage:\n\t%s [ infile | - ]\n",
 			VERSION,
 			argv[0]);
 		fprintf(stderr, "\n");
diff --git a/es_print_linux.c b/es_print_linux.c
index fe9bc69..571f690 100644
--- a/es_print_linux.c
+++ b/es_print_linux.c
@@ -96,7 +96,7 @@ int main(int argc, char **argv)
 
 	/* Cmdline help */
 	if (argc < 2) {
-		fprintf(stderr, "SELPHY ES Print Assist version %s\n\nUsage:\n\t%s infile outdev\n",
+		fprintf(stderr, "SELPHY Print Assist version %s\n\nUsage:\n\t%s [ infile | - ] [ outdev ]\n",
 			VERSION,
 			argv[0]);
 		fprintf(stderr, "\n");