Following the release of iOS 9.3.2, Apple has begun rolling out OS X El Capitan 10.11.5 to Macs around the world. The update is available for download from the “Updates” tab in the Mac App Store. The download weighs around 800MB (around 1GB for some users).
This update doesn’t include any new features or major changes worth noting, as Apple’s release notes for OS X 10.11.5 don’t say anything except the fact that there are bug fixes and security enhancements. New features, such as Siri, should be coming to the Mac in OS X 10.12 which is set to debut this June at WWDC.