From 430410e415e3bf3d2a74f03e2f142d860fadf8d8 Mon Sep 17 00:00:00 2001
From: Antonio Carzaniga <antonio.carzaniga@usi.ch>
Date: Sat, 10 Aug 2019 11:13:26 +0200
Subject: [PATCH] added missing face opt in usage message.

---
 balls.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/balls.c b/balls.c
index 000b85d..7364917 100644
--- a/balls.c
+++ b/balls.c
@@ -315,6 +315,7 @@ void print_usage (const char * progname) {
 	    "\tradius=<min-radius>-<max-radius>\n"
 	    "\tv=<min-velocity>-<max-velocity>\n"
 	    "\tdelta=<frame-delta-time>\n"
+	    "\tface=<filename>\n"
 	    "\tclear=<clear-alpha>\n"
 	    "\t-v :: enables rendering timing statitstics\n",
 	    "\t-c :: disables ball-ball collisions\n",