Manual talk:$wgExtraSubtitle

This didn't work for me (using 1.6.9). After much experimentation I eventually found that the Mediawiki:Tagline did the job, but I also had to edit the monobook main.css file which did say display: none; }
 * 1) siteSub {

to change to something like:

/*display: none;*/ font-size: 84%; font-weight: normal; line-height: 1.2em; color: #7d7d7d; } Visctrix 22:29, 6 March 2007 (UTC)
 * 1) siteSub {

No luck in 1.9.2 either. --GunterS 09:00, 14 March 2007 (UTC)

MediaWiki:Tagline is the correct page but it doesn't allow wiki markup or even HTML. :/ It would be nice to get the extra subtitle (a "site slogan") to show up as well--perhaps it's stylesheet-tagged as something else? -Eep² 08:59, 25 July 2007 (UTC)

The site-wide tagline (MediaWiki:Tagline) can be edited to be blank by editing its contents to " < / p >".

The discussion on the article page is incomplete. The "new" vector skin has .css that blocks display. But it shows on print version.