Kernel Version

[Kaushal Shriyan]

Hi

Please explain me about the Kernel 2.6.16.13 version from www.kernel.org

Here I Know that 2 is a Major Number
                         6 is a Minor Number
                        16 is a Micro Number

My Doubt is what does the number 13 Signifies

Please explain me

Thanks in Advance

Kaushal