Template:Wiki-in-docroot
From MediaWiki.org
Warning: this method may create an unstable URL structure and leave some page names unusable on your wiki. See Manual:Wiki in site root directory.
Please see the article Cool URIs don't change and take a few minutes to devise a stable URL structure for your web site before hopping willy-nilly into rewrites into the URL root.
This template is a warning about why you should not install Mediawiki in the root directory of your website.
