https://git.ruby-lang.org/ruby.git/commit/?id=e7a8e3e91f

From e7a8e3e91f817171176c8b8294f33e5acd3354e2 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Fri, 2 Sep 2022 15:25:46 +0900
Subject: Added entries about test-bundler-parallel and BUNDLER_SPECS

---
 spec/README.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/spec/README.md b/spec/README.md
index 6b82f8f06a..9f5a712219 100644
--- a/spec/README.md
+++ b/spec/README.md
@@ -10,6 +10,14 @@ To run rspec for bundler: https://github.com/ruby/ruby/blob/trunk/spec/README.md#L10
 make test-bundler
 ```
 
+or run rspec with parallel execution:
+
+```bash
+make test-bundler-parallel
+```
+
+If you specify `BUNDLER_SPECS=foo/bar_spec.rb` then only `spec/bundler/foo/bar_spec.rb` will be run.
+
 # spec/ruby
 
 ruby/spec (https://github.com/ruby/spec/) is
-- 
cgit v1.2.1


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