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Summary: Writing a footnote in MLA style is useful for expressing an idea that isn't part of the main line of argument. Make sure footnotes are relevant with tips from an English teacher in this free video on college research papers.
David M. Harris has taught English at Vanderbilt University and elsewhere. He has published poetry, essays, short fiction and a novel, and he has worked in book and magazine publishing.read more
"A number of years ago we used to give all of our citations in footnotes so that the bottom of an academic text would be peppered with these small print notations of where we got our information, but we don't do that anymore. MLA and APA and all the other style systems changed that because it's so much easier just to have an in-text citation and then a list of the works cited at the end, but occasionally we do still use footnotes for a different purpose. If we have an idea that isn't really part of our main line of argument, but is connected to what we're talking about or sometimes if it's just something that's really, really interesting that we want to share with our readers, we can put that in a footnote, and there isn't really any regular system for that except that they should be numbered. So, in general, you're going to be working on a computer, find the tool that lets you insert a footnote, makes sure that it's numbered rather than with an asterisk or some other symbol and go to that and type it in, and make sure that what you're saying is, in fact, relevant, and you're not just amusing yourself."
eHow Article: How to Write Footnotes in MLA Style