I agree with the grandparent -- while trying to determine what this was, I looked at other links to try and find the answer and went down the wrong path.

> Users from every Matrix homeserver can chat with users from all other Matrix servers.

This statement lead me to assumed the "matrix specification" discussed was about server-to-server communication... I'm not interested in digging into the underpinnings of this server-to-server communication (right now) just like I'm not terribly interested in how blockchains keep in sync across nodes... But I am interested in how this whole stack works, and I was lost with this page as the starting point.

So I think it's safe to add an extra sentence to explain the relationship while still keeping the page simplistic and focused.