A security update which changes the Windows OS Build to 10586.71
https://support.microsoft.com/en-au/kb/3124262
This update includes improvements to enhance the functionality of Windows 10 Version 1511.
Windows 10 Version 1511 updates are cumulative. Therefore, this package contains all previously-released fixes. If you have installed previous updates, only the new fixes that are contained in this package will be downloaded and installed to your computer.