Clear Page Cache
From Help With Kumu Wiki
How to clear the page cache on kumu.brocku.ca wikis and any other MediaWiki (ie. Wikipedia)
To clear the cache of a page in MediaWiki, you should add &action=purge to the end of the page's URL in your browser's address bar, e.g. : http://kumu.brocku.ca/help/index.php?title=Clear_Page_Cache&action=purge