From 7ee63aced6c3980e7f836881da984a84cb72e9cd Mon Sep 17 00:00:00 2001
From: Martin Geisler <mgeisler@google.com>
Date: Wed, 28 Dec 2022 10:15:17 +0100
Subject: [PATCH] Mention `Arc` on `Rc` slide

Fixes #67.
---
 src/std/rc.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/std/rc.md b/src/std/rc.md
index e565080d..33972485 100644
--- a/src/std/rc.md
+++ b/src/std/rc.md
@@ -16,7 +16,9 @@ fn main() {
 ```
 
 If you need to mutate the data inside an `Rc`, you will need to wrap the data in
-a type such as [`Cell` or `RefCell`][2].
+a type such as [`Cell` or `RefCell`][2]. See [`Arc`][3] if you are in a multi-threaded
+context.
 
 [1]: https://doc.rust-lang.org/std/rc/struct.Rc.html
 [2]: https://doc.rust-lang.org/std/cell/index.html
+[3]: ../concurrency/shared_state/arc.md