This document provides release notes for ArcSight ESM version 6.0c Patch 1. It includes instructions for installing the patch, which addresses critical issues and provides updates for the ArcSight Manager, Console, Web, and CORR-Engine components. Details are given for stopping services, backing up files, downloading and running the patch installer, accepting the license agreement, and restarting services after installation. Issues fixed and open issues still under investigation are also summarized for each component.