When you make changes to your web page, you can let Yahoo! know by resubmitting the page or feed. You can resubmit a page or feed on our web page submission form. You can also resubmit a feed on the Feeds page while managing a Site. Use either option to indicate that your page or feed have changed.
To automatically keep us informed of all your pages and any changes you make to them, use the Web Services API: UpdateNotification. The UpdateNotification service notifies Yahoo! when your site or a page changes.