https://git.ruby-lang.org/ruby.git/commit/?id=85f0179479

From 85f01794795521e29e64e06ead416cbd3d52c55c Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Thu, 24 Dec 2020 17:14:48 +0900
Subject: doc/keywords.rdoc: mention pattern matching in the `in` keyword
 section


diff --git a/doc/keywords.rdoc b/doc/keywords.rdoc
index a741268..bfd0bec 100644
--- a/doc/keywords.rdoc
+++ b/doc/keywords.rdoc
@@ -82,6 +82,8 @@ if:: https://github.com/ruby/ruby/blob/trunk/doc/keywords.rdoc#L82
 in::
   Used to separate the iterable object and iterator variable in a +for+ loop.
   See {control expressions}[rdoc-ref:syntax/control_expressions.rdoc]
+  It also serves as a pattern in a +case+ expression. See
+  See {pattern matching}[rdoc-ref:syntax/pattern_matching.rdoc]
 
 module::
   Creates or opens a module.  See {modules and classes
-- 
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