When I first submitted my website to Google my website's robots.txt had disallowed the search engines from fetching the URL and so whenever I enter my websites domain to check on google the description shows as "A description for this result is not available because of this site's robots.txt". But now I modified my robots.txt file to allow search engines to crawl the website. How can I force google to re-crawl my website's description?
Use the Submit to Index function of the Fetch as Google tool to re-crawl your URLs
Ask Google to crawl and index your URL
Click Submit to Index, shown next the status of a recent, successful fetch in the Fetches Table.
Select Crawl only this URL to submit one individual URL to the Google for re-crawling. You can submit up to 500 individual URLs in this way within a 30 day period.
Select Crawl this URL and its direct links to submit the URL as well as all the other pages that URL links to for re-crawling. You can submit up to 10 of requests of this kind within a 30 day period.
Click Submit to let Google know that your request is ready to be processed.