By default, UpdatePatrol will notify you when text has changed on a page you monitor. However, there are other kinds of changes you may be interested in getting to know about. You specify per site which ones:
The options are self-explanatory. Notice that notifications for added or removed frames, iframes and links are only available in the Pro version. The list of changed frames, iframes and links can be viewed by clicking the Details button on the main screen when viewing the updated page in the built-in web browser, or you can have the list sent as an attachment to your email notification.