You can easily create footnotes in a slide using the standard Markdown syntax:

Here is some text containing a footnote.[^somesamplefootnote]

## Title 2
- Item 1
- Item 2 **bold** 
	- Sub item
	- sub item 2
		- Sub sub item
[^somesamplefootnote]: Here is the text of the footnote itself.


Currently, footnotes are supported in all layouts but are only fully optimized for layouts having only a single column.