Endnotes get my vote too. Footnotes can mess things up.
In the poetry collection I'm reading at the moment there's a villanelle called "Penelope's Threads". The title has a footnote - "After the Trojan war, Penelope, the wife of Odysseus, waited on Ithaca for his return, but as the years went by her suitors became more pressing, claiming she should give Odysseus up for lost and choose a new husband. Penelope agreed that if Odysseus was not home by the time she had finished a large tapestry she would re-marry, but each night Penelope unpicked the day's work on the tapestry, buying more time for Odysseus's return."
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