You can add a subsidiary heading to your table with:

leaf.table.Subhead 'Subhead Text'   © or
leaf.table.Set 'subhead' text

The subhead only appears on the first page of the table, if it spans several pages either horizontally or vertically. It always has the same alignment as the main heading (set with HStyle) but you may independently change the subhead font and colour.

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

leaf.table.Subhead 'This is Line-1;This is the Second line' 
leaf.table.Subhead 'Printed on 21/3/1953' 'by Adrian'

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