Will updating Mac OS affect my Windows/Bootcamp partition?

On Macbook Air, I have OSX 10.9.4 and it allows me to update to Yosemite, will this affect the Windows 7 partition that I installed using Bootcamp ?

Edit: I had two windows partitions, after update, windows cannot see the second Fat32 partition, just the main windows partition. Mac sees both windows partitions and says second one is "Fat32" but windows sees that as unpartitioned space. Not sure what to do next.