Add header to a file produced using the writeAsFormattedText method

[Papadopoulos, Konstantinos]

Hi all,

I am trying to produce a file from a dataset using the writeAsFormattedText 
method (e.g., data.writeAsFormattedText(filename, writeMode, formatter)).
Is there any easy way to add a header to the file produced?

Thanks in advance,
Konstantinos