linode/docs — pull request #101 by akerl (2014-10-21 20:53:00+00:00)
Title: Update Arch LAMP guide to replace -Sy with -Syu

pacman -Sy can cause dependency issues since it will pull repository updates but not upgrade all packages, so it can take you to a newer version of the specified package but not apply a needed upgrade for something already installed that your new package depends on.