Forum:Change a wiki's Google summary

Recently I noticed Wikia wikis may have a text summary displayed under their name when shown in Google results. How do I change that text?... Klow 08:35, June 24, 2010 (UTC)
 * Help:Description 01:38, 24 June 2010
 * Thanks! Klow 09:31, July 1, 2010 (UTC)