Insert a superscript Arabic number at the end of the sentence which involves the explanatory note. This superscript number should fall just after the final punctuation of the sentence. This number corresponds to the footnote or endnote of your paper.
Create a corresponding explanatory note number following the guidelines for endnotes or footnotes. Endnotes appear at the end of the written work under the heading "Notes". Footnotes fall at the bottom of the page in which the information is utilized.
Write an explanatory note that remains simple and to the point. This note should only be about two sentences long and offer the reader a quick reference for further information. An explanatory note often offers further readings or brings up the arguments of another author. Only discuss information that is absolutely relevant or useful. For example: "Further work has been done on issues of ageism in John Smith's painstaking volumes on the hospice system."