Thread:Extension talk:HelpPages/Supplementary local info added to the bottom?

Is there any way we could add, or link to, some supplementary local information, at the page that was transcluded from mediawiki.org? Eg. mw:Help:User page would go everywhere, but then en:Help:User page could add some additional sections at the bottom.

(Afaik this is impossible, and any wiki that wanted supplementary info would need to create a local copy and add it to that.)