mozilla/kuma — pull request #1515 by openjck (2013-10-16 02:04:27+00:00)
Title: Update docs to append to, not replace, /etc/hosts.

The previous command (sudo tee /etc/hosts) completely replaces /etc/hosts with
standard input. The -a option (sudo tee -a /etc/hosts) ensures standard input is
only appended to /etc/hosts.