2022/06/24
That on GitHub, you can add footers like
statement[^1]
[^1]: footnote
See https://github.blog/changelog/2021-09-30-footnotes-now-supported-in-markdown-fields/ or https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#footnotes