Edit jqgrid column

Question

as i am new to jqgrid,my question be stupid one, my requirement is that i need to implement an editable jqgrid.but the problem is i want one column to be in editable form by default.

{ name: 'Description', index: 'Description', classes: 'align_left padding_left_10 padding_right_10', width: '290', editable: true },

i have set editable option to true.i can achieve requirement by using

 var grid = $jqGrid("#" + gridid + ""),
                          ids = grid.jqGrid('getDataIDs'), i, l = ids.length;
                for (i = 0; i < l; i++) {
                    grid.jqGrid('editRow', ids[i], true);
                }

but this makes other columns also to editable form.is there any way to achieve single column editable mode by default.Thanks in advance.