Either add sudo or mention root is needed

rippler@ubuntu:~$ source /etc/bash_completion.d/ee
rippler@ubuntu:~$ ee site create example.com --wp
-bash: /usr/local/sbin/ee: Permission denied
rippler@ubuntu:~$ sudo ee site create example.com --wp
Adding rtCamp NGINX launchpad repository, please wait...
Merge pull request #386 from rippler/patch-3

Either add sudo or mention root is needed