https://git.ruby-lang.org/ruby.git/commit/?id=9e3bfed53c

From 9e3bfed53ced0ce2970710338863f811759c8d67 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Wed, 22 Jan 2020 16:02:10 +0900
Subject: Added usage documentation for sync_default_gems


diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index 7044f1e..03db90e 100644
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -1,5 +1,13 @@ https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L1
 # sync following repositories to ruby repository
 #
+# Usage:
+# git clone from the upstream repository and copy from the upstream repository with cp -rf. It's lost the git commits.
+# $ ruby tool/sync_default_gems.rb rubygems
+# pick the single commit from the upstream repository.
+# $ ruby tool/sync_default_gems.rb rubygems 97e9768612
+# pick the commits range from the upstream repository
+# $ ruby tool/sync_default_gems.rb rubygems 97e9768612..9e53702832
+#
 # * https://github.com/rubygems/rubygems
 # * https://github.com/rubygems/bundler
 # * https://github.com/ruby/rdoc
-- 
cgit v0.10.2


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