Manual:$wgAllowAnonymousMinor

Category:MediaWiki configuration settings#AllowAnonymousMinorCategory:MediaWiki configuration settings introduced in version 1.2.0#AllowAnonymousMinorCategory:MediaWiki configuration settings removed in version 1.6.0#AllowAnonymousMinorCategory:MediaWiki deprecated or obsolete features#AllowAnonymousMinorCategory:Permission variables#AllowAnonymousMinor
User rights, access control and monitoring: $wgAllowAnonymousMinor
Allow anonymous users to mark changes as "minor"
Introduced in version:1.2.0
Removed in version:1.6.0
Allowed values:(boolean)
Default value:false

Details

Allow anonymous users to mark changes as "minor"

Another way to do this is adding this to LocalSettings:

$wgGroupPermissions['*']['minoredit']    = false;
Category:MediaWiki configuration settings Category:MediaWiki configuration settings introduced in version 1.2.0 Category:MediaWiki configuration settings removed in version 1.6.0 Category:MediaWiki deprecated or obsolete features Category:Permission variables