describe parameter in usage part

1 files changed, 10 insertions, 2 deletions

diff --git a/src/advtime.c b/src/advtime.c
index 376d983..be0427e 100644
--- a/src/advtime.c
+++ b/src/advtime.c
@@ -86,7 +86,15 @@ frame_average(struct video_frame *frame)
 static void
 usage(void)
 {
-	fprintf(stderr, "advtime [-a] [-d] FILE\n");
+	fprintf(stderr,
+		"advtime [-adfs] FILE\n"
+		"\n"
+		"OPTIONS\n"
+		"\t-a\tcalculate average color of a frame\n"
+		"\t-d\tcalculate difference betweenprev and next frame\n"
+		"\t-f\tprint frame number\n"
+		"\t-s\tsave frame from detected cut\n");
+
 	exit(EXIT_FAILURE);
 }
 
@@ -110,7 +118,7 @@ main(int argc, char **argv)
 			diff_flag = 1;
 			break;
 		case 'f':
-			diff_flag = 1;
+			frame_flag = 1;
 			break;
 		case 's':
 			showcut_flag = 1;