Do as a webmaster do

Google Webmaster Tools is a no-charge web service by Google for webmasters. It allows webmasters to check indexing status and optimize visibility of their websites.

It has tools that let the webmasters:

• Submit and check a sitemap
• Check and set the crawl rate, and view statistics about how Googlebot accesses a particular site
• Generate and check a robots.txt file
• List internal and external pages that link to the site
• See what keyword searches on Google led to the site being listed in the SERPs, and the click through rates of such listings
• View statistics about how Google indexes the site, and if it found any errors while doing it
• Set a preferred domain (e.g. prefer wikipedia.org over www.wikipedia.org or vice versa), which determines how the site url is displayed in SERPs