diff --git a/etc/letsencrypt/cli.ini b/etc/letsencrypt/cli.ini
index 3b39670..5207004 100644
--- a/etc/letsencrypt/cli.ini
+++ b/etc/letsencrypt/cli.ini
@@ -1,6 +1,7 @@
 # 2021-02-20 Dmitry Fedyuk https://www.upwork.com/fl/mage2pro
-# "Automatically reload Nginx after the Let's Encrypt certificate's renewal":
+# 1) "Automatically reload Nginx after the Let's Encrypt certificate's renewal":
 # https://github.com/alsaifgallery-com/server/issues/1
+# 2) "How to automatically reload Nginx after a Let's Encrypt certificate renewal via certbot / systemd?": https://df.tips/t/1074
 deploy-hook = systemctl reload nginx
 # Because we are using logrotate for greater flexibility, disable the internal certbot logrotation.
 max-log-backups = 0
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