Digital Download Pro uses Subtitles plugin to add subtitles to pages and posts. Subtitles add a great introduction to the page/post with a little text.

You need to install Subtitles plugin to add subtitles in the page/post. You will notice a Subtitle field below the Page/Post titles. Whenever you add a subtitle to a page/post, you will see it is displayed into the header of your post/page.