Hi all,
I've just written a tool adding one or more **extra column** in a [VCF file](http://www.1000genomes.org/wiki/doku.php?id=1000_genomes:analysis:vcf3.3). The header now looks like this:

	(...)
	#CHROM    POS    ID    REF    ALT    QUAL    FILTER    INFO    MY_COL1    MY_COL2    FORMAT    NA00001    NA00002    NA00003
	(...)

Is there something in the **VCF** spec saying that another column can't be added ?
because when I used **VCFTOOLS**, it says:

	vcftools --vcf file.vcf 
	(...)
	Scanning file.vcf ... 
	Ninth Header entry should be FORMAT: MY_COL1
	Currently scanning CHROM: 19
	Currently scanning CHROM: 20
	Currently scanning CHROM: X
<p>Which kind of information do you want to add? I don't think that the VCF specifications allow to add new columns, but since this format is still in an early phase of development, you could contact the authors and propose them a new functionality.</p>
<p>However, VCF files should be used only to describe the SNPs and their genotypes, and any other kind of information should go somewhere else... for example, if you have statistics associated with a snp, you should consider a flat file or a database.</p>