What is a Footnote? Complete Guide to Footnote Citations, Formatting & Usage

What is a Footnote?

A footnote is a reference or additional piece of information placed at the bottom of a page in an academic or professional document. It provides the reader with source details or explanations related to a specific part of the text. Footnotes are commonly used in the Chicago and Oxford referencing styles and serve as an alternative to in-text or parenthetical citations.

How Footnotes Work

Each time a writer references a source or adds an explanatory note, a superscript number (e.g., ¹) appears in the text. The corresponding note with full citation or explanation is placed at the bottom of the same page. This allows readers to easily locate source details without interrupting the flow of reading.

Formatting Footnotes Correctly

• Numbering: Use superscript numbers that restart on each page or continue throughout the paper.
• Placement: Footnotes appear at the bottom margin of the page.
• Font and Spacing: Usually in smaller font size, single-spaced, with a space between notes.
• Content: Include author name, title, publication details, and page number.

Advantages of Using Footnotes

• Maintains readability by avoiding lengthy in-text references.
• Provides space for explanatory comments without cluttering the main text.
• Helps readers easily verify sources directly on the same page.

Example of Footnote in Chicago Style

Text: According to recent research, climate change impacts are accelerating.¹

Footnote: ¹ John Smith, Climate Change and Society (New York: Academic Press, 2021), 45.

Footnote Best Practices

• Be consistent in style and numbering throughout the document.
• Use footnotes mainly for citations or brief clarifications, not for lengthy discussions.
• Follow the style guide (Chicago, Oxford, etc.) required by your institution or publisher.