Just this Monday, after the launch of iOS 8.1.1 to the public, Apple also rolled out an update for OS X Yosemite.
Version 10.10.1 of OS X Yosemite can be downloaded right now by Mac users. It can be accessed from the Software Update button from the button in the Menu Bar or directly from the Mac App Store.
OS X Yosemite 10.10.1 fixes issues regarding reliability of Wi-Fi, reliability with Microsoft Exchange server connectivity, reliability of the Mail app, and reliability of Back to My Mac feature.
The update is as always free and is suggested to be downloaded by all Mac OS X users.