Robert, the hyperlink takes you immediately to the end of the chapter where the endnote (like a footnote except a footnote is at the bottom of the page and the endnotes are collected at the end of the chapter) is located.
Personally, I almost never read the endnotes while I'm reading the text. I read the chapter, and then read all the endnotes at once to see if any are interesting. But I agree that the hyperlink would be a good thing to have.
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