RVM not found after installing as root

I've installed RVM per the instructions at https://rvm.beginrescueend.com/rvm/install/

I logged in as my users and then su to root. Then I followed the multi-user instructions on the install guide.

The last step it says:

Multi-User:

The rvm function will be automatically configured for every user on the system if you install as root.

However, when I run the RVM command it is not found. Is there some additional step I need to do to get bash to recognize the RVM command?

check the RVM webpage for the post-installation steps:

a) modify your .bash_profile , so that RVM gets started for every new shell b) start a new shell

Note also: The author of RVM explicitly writes that he doesn't recommend installing RVM system-wide as root