Another index-related question

[Richard Hamilton <dick@rlhamilton.net>]

As long as I'm harping on indexes, is there an easy way to get introductory text into the beginning of a generated index? I'd like to have a paragraph that describes typographical conventions in the index, or for another use case, be able to introduce a specialized index.

I could do this by hand, after the index is generated, but if there is a better, cleaner way to do this, it would be nice.

Best Regards,
Dick
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