diff --git a/base/science-tech-maths/programming/dev-tools/ssh/ssh.md b/base/science-tech-maths/programming/dev-tools/ssh/ssh.md
index fc2f5e5..fcfd41a 100644
--- a/base/science-tech-maths/programming/dev-tools/ssh/ssh.md
+++ b/base/science-tech-maths/programming/dev-tools/ssh/ssh.md
@@ -13,3 +13,5 @@ Cloudflare Tunnel: <https://orth.uk/ssh-over-cloudflare/>
 <https://news.ycombinator.com/item?id=37886049>
 
 <https://nickjanetakis.com/blog/using-a-custom-ssh-key-to-access-a-private-git-repo>
+
+Visual guide to SSH tunneling and port forwarding: <https://ittavern.com/visual-guide-to-ssh-tunneling-and-port-forwarding/>