From 6954da78fb08b7aa0b7f881444fd909fd2fcfdd3 Mon Sep 17 00:00:00 2001
From: Oliver Smith <osmith@sysmocom.de>
Date: Wed, 7 Sep 2022 15:48:16 +0200
Subject: [PATCH] tools/gtp-link: add --sgsn to usage

Change-Id: I995754812b8418757a8df9ab2a3c208d61f16a8c
---
 tools/gtp-link.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/gtp-link.c b/tools/gtp-link.c
index 8367c6e..d342f2b 100644
--- a/tools/gtp-link.c
+++ b/tools/gtp-link.c
@@ -46,7 +46,8 @@ int main(int argc, char *argv[])
 	int ret, sgsn_mode = 0;
 
 	if (argc < 3) {
-		printf("Usage: %s <add|del> <device>\n", argv[0]);
+		printf("Usage: %s add <device> [--sgsn]\n", argv[0]);
+		printf("       %s del <device>\n", argv[0]);
 		exit(EXIT_FAILURE);
 	}