These need to be separated from the main body of the text, and are best set with a smaller size and possibly event a different typeface and colour. The idea of any notes is that it is supplementary information and it is entirely optional that the reader even bothers to look, so setting in a style that does not distract from the flow of the reading experience is important.
Sidenotes or Marginnotes - Feature Requests - RemNote
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Endnotes v/s Footnotes Referencing - MakeMyAssignments Blog
Nisus Writer Pro User Guide
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Convert Fixed Notes to Dynamic Footnotes/Endnotes
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How to write notes on the margin of a word file - Quora
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148. Using endnotes in Microsoft Word : Help : ITS : University of Sussex