From 70ee9363671ff5aead633807b9579dab22f94cf3 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 31 Oct 2020 19:44:26 +0900
Subject: Update the build description in `mruby3.md`.

---
 doc/mruby3.md | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'doc')

diff --git a/doc/mruby3.md b/doc/mruby3.md
index 12cc78a1b..fdf21ed19 100644
--- a/doc/mruby3.md
+++ b/doc/mruby3.md
@@ -13,9 +13,12 @@ directory. For examples:
 * `boxing`: compiles all three boxing options
 * `clang-asan`: compiles with `clang`'s Address Sanitizer
 
-`build_config/${MRUBY_CONFIG}.rb` is used if the path specified
-in `MRUBY_CONFIG` doesn't exist, so you can specify it as
-`rake MRUBY_CONFIG=boxing`.
+You can specify the build configration file with the
+`MRUBY_CONFIG` environment variable (or `CONFIG` in short).
+If the value specified by `MRUBY_CONFIG` is not the path to
+the configuration file, `build_config/${MRUBY_CONFIG}.rb` is
+used.  So you can specify it as `rake MRUBY_CONFIG=boxing`,
+for example.
 
 # Build Configuration Contribution
 
-- 
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