I’m confused

iMovie book/Missing CD missing chapter marker info

iMovie '09 book references (on p327) a method of inserting chapter markers in iDVD but doesn't describe or explain how because its "covered in this chapter's free downloadable appendix" in the Missing CD on this website. That MIssing CD now says:Chapter 16
Bonus appendix: More Chapter Markers
Coming Soon

Why is this information not available? I have purchased the book already. Thanks
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