Manual:$wgMaxCredits

Details
Set this to the number of authors that you want to be credited below an article text (in the footer). Set it to zero to hide the attribution block, and a negative number (like -1) to show all authors. Note that this will require 2-3 extra database hits for every single page view, which can have significant impact on performance for large wikis. The users are listed in chronological order by most recent edit.

Example:  

Related system messages

 * MediaWiki:Lastmodifiedatby
 * MediaWiki:Othercontribs
 * MediaWiki:Siteusers
 * MediaWiki:Siteuser
 * MediaWiki:Anonymous
 * MediaWiki:Anonuser
 * MediaWiki:Anonusers