Cydia: what's Rocky racoon 5.1.1?

[Manzanas]

I've been asked by cydia to update again (same thing) with the update named as Rocky racoon 5.1.1.

What is this, and why do I have to update again, after I already did it once?

Iphone 4S JB WITH absinthe 2.0.1

 

[kch50428]

It's the exploit that allows for untethering... just do it.