From 4f44c5efa13813b3e4129a2e0e59423c83c4401f Mon Sep 17 00:00:00 2001
From: Devaev Maxim <mdevaev@gmail.com>
Date: Wed, 19 Feb 2020 16:46:13 +0300
Subject: [PATCH] hint

---
 src/options.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/options.c b/src/options.c
index e22a6bd..0c01725 100644
--- a/src/options.c
+++ b/src/options.c
@@ -588,6 +588,7 @@ static void _help(struct device_t *dev, struct encoder_t *encoder, struct http_s
 	printf("    --backlight-compensation <N|default>  ─ Set backlight compensation. Default: no change.\n\n");
 	printf("    --white-balance <N|auto|default>  ───── Set white balance. Default: no change.\n\n");
 	printf("    --gain <N|auto|default>  ────────────── Set gain. Default: no change.\n\n");
+	printf("    Hint: use v4l2-ctl --list-ctrls-menus to query available controls of the device.\n\n");
 	printf("HTTP server options:\n");
 	printf("════════════════════\n");
 	printf("    -s|--host <address>  ──────── Listen on Hostname or IP. Default: %s.\n\n", server->host);