Prior to becoming known under its current name, CentOS originated as a build artifact of cAos Linux. At the time,[when?] some of the cAos contributors were merely interested in this build artifact for their own use, citing difficulties in collaborating with other noteworthy Red Hat Enterprise Linux (RHEL) clones of the time.[citation needed]
In June 2006, David Parsley, the primary developer of Tao Linux (another RHEL clone), announced the retirement of Tao Linux and its rolling into CentOS development. Tao's users migrated to the CentOS release via yum update.