You can add a footnote to your table with:

leaf.table.Footnote 'Footer Text'

The footnote only appears at the very end of the table, if it spans several pages either horizontally or vertically. By default, the footnote is left-aligned, but this may be changed using the footnote style. You may also change the font and colour.

You can specify linebreaks in the footer by including the semi-colon character in the text or by passing a nested vector:

leaf.table.Footnote 'This is Line-1;This is the Second line' 
leaf.table.Footnote 'Printed on DD/MM/YY' 'by User nnn'

See also table caption, heading and subhead for other ways of adding text elements to tables.