diff --git a/Blog-articles-and-HowTos.md b/Blog-articles-and-HowTos.md
index 3f8b8f8..c74c602 100644
--- a/Blog-articles-and-HowTos.md
+++ b/Blog-articles-and-HowTos.md
@@ -6,6 +6,7 @@
 - https://www.splitbrain.org/blog/2016-05/14-simple_letsencrypt_on_debian_apache
 - https://alexschroeder.ch/wiki/2016-05-31_letsencrypt.sh_instead
 - https://calomel.org/lets_encrypt_client.html
+- https://b3n.org/intranet-ssl-certificates-using-lets-encrypt-dns-01/
 
 ## German