You can use footnotes and endnotes in documents to explain, comment on, or provide references to something you've mentioned in your document. Usually, footnotes appear at the bottom of the page and endnotes come at the end of the document or section
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After you add your footnotes and endnotes, you can change the way they appear. For example, you can change the number format or where they show up in your document.
Tip: To restart footnote or endnote numbering at the beginning of each section, in the Footnote and Endnote box, click Footnotes or Endnotes, and in Numbering, click Restart each section.