Reprinted from TidBITS by permission; reuse governed by Creative Commons license BY-NC-ND 3.0. TidBITS has offered years of thoughtful commentary on Apple and Internet topics. For free email subscriptions and access to the entire TidBITS archive, visit http://www.tidbits.com/ OS X Mountain Lion 10.8.2 Supplemental Update 2.0 Adam C. Engst Reverting to release notes that make haiku seem wordy, Apple has released something called [1]OS X Mountain Lion 10.8.2 Supplemental Update 2.0 that claims to address 'an issue with Keychain that can affect 2012 Mac systems.' It's recommended for all Macs introduced in 2012, but there's nothing else that hints at what it fixes or how serious it might be. It's available via the App Store's Updates screen, and if it doesn't appear for you, it's presumably not necessary for your Mac. (Free, 26.65 MB) References 1. http://support.apple.com/kb/DL1611 .