Extra comment field for tracking setup revision or similar

Hello 

I have different configuration versions available for the same Fortigate unit depending on the later use. The Fortigates are goingto be installed in different production units. I am looking for some sort of comment field where I can insert my setup revision. For example machine A has setup "RevA1.22" and B has "RevB2.09". This information later helps me to see which customer has which version. The host name field is already in use for the name of the production unit. The needed information could be attached to the host name but this is not really what I would like to do.

Is there another comment field which can be used for this purpose?

Marcus