changing the default modx manager logo on the logon screen

HI All

I was wondering if somebody could shed some light on the backend manger. I need to be able to change the default modx logo on the manager logon screen and was wondering how to do this?

You should be able to change the login screen by updating the template and image(s) accordingly.

Template: manager/templates/default/security/login.tpl
Images: manager/templates/default/images/modx-logo-color.svg & manager/templates/default/images/modx-logo-color.png

I'm not sure if there is a recommended method to update the login screen, preventing updates from resetting the code.