Load header columns into Flat File

Hi I am new to SSIS and my requirement is to load data from table to flatfile which I did. However I need to show the header in the target flat file.

Eg: My source table query is

select eno, ename from emp;

10, Tony

11, Wood

OUTPUT:

eno,ename

10,Tony

11,Wood

I think I need to check the box 'Columns names in the first data row' But I am loosing the variable mapping if I did.

Please help me.