Upgrading CodeIgniter from 1.6.1

[eluser]Unknown[/eluser]
Hi.
I have CodeIgniter 1.6.1. How do I upgrade it to 1.7.3?

[EDIT]: Sorry for the noobish question, I found the answer.

[eluser]InsiteFX[/eluser]
You should only have to copy the new system directory over.

Do not touch your application directory.

Afterwards you may need to make so minor changes.

InsiteFX