You may also be presented with...

KB2883200
Windows 8.1 and Windows Server 2012 R2 General Availability Update Rollup

then
KB2884846
Windows 8.1 and Windows Server 2012 R2 update rollup: October 2013

I am just advising those who may not know, to run windows updates a few times after upgrade and subsequent update reboots (due to above updates) to make sure they are fully up to date.

yeah, i know, read that a few times, it's a bit thick, eh?