Because I had already written the footnote once, when it came up on another page later I simply marked it as Ibidem.

If you see the word ‘Ibidem’ in a footnote, it means that particular footnote has already been mentioned on a different page.

The word Ibidem refers to a footnote that has already been made, so the writer doesn’t have to write the same footnote multiple times.

An Ibidem in a scholarly paper is simply denoting a footnote that has already been mentioned but has come up a second time.

To avoid writing out the same footnote every time it comes up in a paper, you can mark the footnotes following the original as Ibidem.