MediaWiki extensions manual
Release status: beta
Implementation Parser extension , Hook
Description Adds a link to related sites on the sidebar
  • Roland Unger
  • Hans Musil
  • Matthias Mullie
Latest version 2.0
MediaWiki 1.25+
PHP 5.4+
Database changes No
License GNU General Public License 2.0 only
  • $wgRelatedSitesPrefixes
Quarterly downloads 0
Translate the RelatedSites extension if it is available at translatewiki.net
Issues Open tasks · Report a bug

One of the Wikivoyage extensions, formerly used to add a link to a same-named article on a related site on the sidebar. The extension was removed from Wikivoyage in 2018 as much of its functionality overlaps the "In other projects" sidebar entry from Extension:Wikibase.


  • Download and place the file(s) in a directory called RelatedSites in your extensions/ folder.
  • Add the following code at the bottom of your LocalSettings.php :
    wfLoadExtension( 'RelatedSites' );
  •   Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.


$wgRelatedSitesPrefixes is an array of interwiki prefixes of sites you would like to give prominence to. For example, for Wikivoyage this is:

$wgRelatedSitesPrefixes = [ 'wikipedia', 'commons' ];

Make sure you also have these prefixes set up in $wgExtraInterlanguageLinkPrefixes .


Create a task on Phabricator tagged with "MediaWiki-extensions-RelatedSites".