how to make a html link in elisp?

[Xah Lee]

in a emacs function doc string, how do i make it a clickable link?
i.e. so that when user do describe-mode, they can click on the link to
go to doc page.

e.g.

(defun xyz-mode ()
  "Major mode for editing LSL (Linden Scripting Language).
 ...

Goto home page: click me <http://xyz -mode.com/doc.html>
"
...
)

Thanks.

  Xah
∑ http://xahlee.org/

☄