linux - What's the difference between "uname -r" and "uname -v"?

I am using CentOS 6.2. In the man page of uname (i.e., man uname), it says:

 -r, --kernel-release
              print the kernel release

 -v, --kernel-version
              print the kernel version

While trying the command, it shows

[max@localhost ~]$ uname -r

2.6.32-220.17.1.el6.i686

[max@localhost ~]$ uname -v

#1 SMP Tue May 15 22:09:39 BST 2012

-v should show the version, right? But where is it showing the version? -r is showing the version detail.

Why is this so?