[Vala] how to view Valadoc in Devhelp?

[Adam Dingle <adam medovina org>]

According to the Valadoc wiki page (http://live.gnome.org/Valadoc), 
Devhelp integration is "done", and the page contains a link to a file 
devhelp-books.tar.gz, which presumably holds the Valadoc documentation 
in Devhelp format.  I downloaded and unzipped this file, but it's not 
obvious what I need to do to make its contents actually show up in 
Devhelp.  Does anyone know how to do that?  If so, could they briefly 
explain here and/or update the wiki with an explanation?

thanks!
adam