I would likely write a note mainly to let them know it was my decision and mine alone, no one else, and some post-mortem instructions. That is about it as I don't want to get into a long explanation of my reasons and why I chose to CTB. This is because I've learned that people won't read all of it, of those that do will oftenly spin it in such a way that is incorrect (not that it matters to me because I'd be dead by then - but no point in wasting my time and energy just for them to 'not get it' or spin it in their liking), and it wouldn't change much either way. Instead, I have a manifesto that I've already written and planned to spread once my time comes which would be mostly to push pro-choice narratives in an anti-choice world; that's the most impactful thing I can do and much more than appealing to people who just won't get it. Finally, I've listed all my reasons in this forum, for people who will get it and understand it without judgment, spinning, or misrepresentation.