Looksie

Looksie is the ultimate mockup documentation generator! Perhaps you want to include some other information with it, such as specifications, details on certain aspects of the design, documentation on related systems, whatever.

So you export the mockup to image files, or to PDF. If you've exported the mockups as images, you then paste those into a Word document and lay it out just right. Add some commentary, perhaps a table of contents. And you've got no control how that PDF is laid out.