Adding header to an rdd before saving to text file

[upendra 1991]

I am reading a CSV(file has headers header 1st,header2) and generating rdd, 
After few transformations I create an rdd and finally write it to a txt file. 
What's the best way to add the header from source file, into rdd and have it 
available as header into new file I.e, when I transform the rdd into textfile 
using saveAsTexFile("newfile") the header 1, header 2 shall be available.

Thanks,Upendra