From 850e200e845be30ba18da8eedc5a50d33566523d Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Tue, 25 Aug 2020 11:49:31 +0900
Subject: Describe the need for `-o` option if multi files given.

---
 mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c b/mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c
index 98b4c042d..acad28bd8 100644
--- a/mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c
+++ b/mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c
@@ -33,7 +33,7 @@ usage(const char *name)
   static const char *const usage_msg[] = {
   "switches:",
   "-c           check syntax only",
-  "-o<outfile>  place the output into <outfile>",
+  "-o<outfile>  place the output into <outfile>; required for multi-files",
   "-v           print version number, then turn on verbose mode",
   "-g           produce debugging information",
   "-B<symbol>   binary <symbol> output in C language format",
-- 
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