Manual:$wgMaxCredits

Details
Set this to the number of authors that you want to be credited below an article text. 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, which can have a not insignificant impact on performance for large wikis.

Related system messages

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