diff --git a/Glossary.md b/Glossary.md
index 813dc57..9cdb68b 100644
--- a/Glossary.md
+++ b/Glossary.md
@@ -43,7 +43,7 @@ Single Sign-On. A way to log in to site B using the identity of site A. See [Ide
 
 ## NAT 
 
-[Network Address Translation](https://en.wikipedia.org/wiki/Network_address_translation). To see how Tailscale gets through NATs, see [How NAT Traversal Works](https://tailscale.com/blog/how-nat-traversal-works/).
+[Network Address Translation](https://en.wikipedia.org/wiki/Network_address_translation). To see how Tailscale gets through NATs and Firewalls, see [How NAT Traversal Works](https://tailscale.com/blog/how-nat-traversal-works/).
 
 ## Node