https://git.ruby-lang.org/ruby.git/commit/?id=9a55fd37c9

From 9a55fd37c926f7297e2039a0436aae755a06ce78 Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maximechevalierb@g...>
Date: Thu, 3 Jun 2021 15:25:53 -0400
Subject: Update README.md

---
 README.md | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index ad086132af..705864f82e 100644
--- a/README.md
+++ b/README.md
@@ -162,23 +162,28 @@ There are 3 test suites: https://github.com/ruby/ruby/blob/trunk/README.md#L162
 The tests can be run in parallel like this:
 
 ```
-make -j16 test-all
+make -j16 test-all RUNOPTS="--yjit-call-threshold=1"
 ```
 
-You can run one specific test in `btest`:
+Or single-threaded like this, to more easily identify which specific test is failing:
 
 ```
-make btest BTESTS=bootstraptest/test_ractor.rb
+make test-all TESTOPTS=--verbose RUNOPTS="--yjit-call-threshold=1"
 ```
 
 To debug a single test in `test-all`:
 
 ```
-make test-all TESTOPTS=--verbose
-make test-all TESTS='test/-ext-/marshal/test_usrmarshal.rb' RUNRUBYOPT=--debugger=lldb
+make test-all TESTS='test/-ext-/marshal/test_usrmarshal.rb' RUNRUBYOPT=--debugger=lldb RUNOPTS="--yjit-call-threshold=1"
+```
+
+You can also run one specific test in `btest`:
+
+```
+make btest BTESTS=bootstraptest/test_ractor.rb RUNOPTS="--yjit-call-threshold=1"
 ```
 
-There are shortcuts to run/debug `test.rb`:
+There are shortcuts to run/debug your own test/repro in `test.rb`:
 
 ```
 make run  # runs ./miniruby test.rb
-- 
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