bcftools annotate -a

Question

[anasjamshed]

As I know that bcftools annotate -a takes 2 arguments,vcf files and annotation file.

Can anyone provide me with some example vcffile and bcf file with annotations to test the tools

[barslmn]

Here is a detailed documentation: https://samtools.github.io/bcftools/howtos/annotate.html

[anasjamshed]

how can i use just -a?