fixed column update- update footer values

thanks for datatable is awesome
i have a question, i have a table with a sum of columns values in the footer and fixed columns, so when the data changes the footer values should change but they don't. in the documentation of fixedColumns().update() state that we should update the new table which was created to deploy fixed column. example in the doc.

var table = $('#myTable').DataTable();

table.cell( 0, 0 ).data( 'New data' ).draw();
table.fixedColumns().update();

but i need to update the footer values of the new fixed table and the main table.
thanks in advanced