From a8825eb8532f75436415942ada254965ca43ff1f Mon Sep 17 00:00:00 2001
From: John-Paul Bader <contact@smyck.org>
Date: Thu, 10 Aug 2023 09:48:31 +0200
Subject: [PATCH] Update upgrade_guide.md

---
 upgrade_guide.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/upgrade_guide.md b/upgrade_guide.md
index 3cba2c9..cc57ca8 100644
--- a/upgrade_guide.md
+++ b/upgrade_guide.md
@@ -1,6 +1,7 @@
 ## References
 
 * https://docs.freebsd.org/en/books/handbook/cutting-edge/
+* https://klarasystems.com/articles/managing-boot-environments/
 
 ## Preparations