https://git.ruby-lang.org/ruby.git/commit/?id=3979f22cc1

From 3979f22cc1a224bad5b8f14610db253660aa974c Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Tue, 13 Aug 2019 01:45:10 +0900
Subject: Explain the current status of branches [ci skip] (#2350)


diff --git a/.github/workflows/check_branch.yml b/.github/workflows/check_branch.yml
index 89561a7..1dd5872 100644
--- a/.github/workflows/check_branch.yml
+++ b/.github/workflows/check_branch.yml
@@ -1,5 +1,12 @@ https://github.com/ruby/ruby/blob/trunk/.github/workflows/check_branch.yml#L1
-# This is enabled on protected branches except master.
-# This will be used to achieve [Misc #16094] later.
+# Protected branches:
+#   * master: Synchronized between cgit and GitHub bidirectionally [experimental]
+#   * other branches: Only writable from cgit.
+#
+# Bidirectional sync is still WIP, so "write" is not permitted to ruby-commiters
+# team yet. Still under testing.
+#
+# And this is enabled for "other branches" to prevent us from merging them.
+# See also: https://bugs.ruby-lang.org/issues/16094
 name: check_branch
 on: [pull_request]
 jobs:
-- 
cgit v0.10.2


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