TIL about Markdown reference style links

After years of writing Markdown I only recently discovered that you can use any identifier in a reference style link. I had made the incorrect assumption that the identifier had to be a number, but no!

Before

[I am an example link][1]

[1]: https://example.com

After

I am an example link][example]

[example]: https://example.com

I've spent a long time re-ordering/numbering my reference links in the past but that should no longer be necessary.