Footnotes in Google docs

Official Google Docs Blog: Adding footnotes to your documents

Last week, we added support for footnotes. You can find footnotes in the Insert menu. When you create a footnote, it'll appear to the right of the document margin and a footnote marker (#) will appear within the actual document. You can drag and drop footnotes anywhere you'd like by clicking on the pound sign and dragging it.

But in a printed do or PDF it appears as a normal footnote; nice!!