RE: About :link

[Drew Adams]

> `:link LINK-DATA'
>      Include an external link after the documentation string for this
>      item.  This is a sentence containing an active field which
>      references some other documentation.
> 
> What does the `active field' mean?  I've gone through the 
> manual, but I don't find what it means.

It means that you can click on the text as a link, and the link will be followed
(outside of Emacs - it's an external link).

But unless you find "active field" explained somewhere, that's a doc bug, IMHO.
`M-x report-emacs-bug'.