Google does not index your site as soon as you update it. The update frequency is unknown generally. However, frequently updated sites like news blogs etc., get indexed within hours or minutes and some reputed sites even get indexed instantaneously. You should wait a few days like 2 or 3 weeks and check again. If your site has facility to submit sitemap (via google webmaster tools), you should do so, which will hasten the next google crawl of your site.