https://techcrunch.com/2022/07/09/pitch-deck-appendix/

From the sample pitch decks in my pitch deck teardown series, you’d conclude that appendices in pitch decks are rare. That would be inaccurate; I’d estimate that more than 70% of decks used actively in pitching startups to investors include one or more appendices. Moreover, whenever I coach clients on building their pitch decks, we end up with an appendices section almost every time.

So today, let’s break down why you might need an appendix — and detail which slides get relegated to the after-party.