System Settings : Advanced : Meta fields
 
Meta fields
The System Settings > Advanced > Meta Fields menu enables you and other administrators to add extra information when configuring, adding, or maintaining FortiGate units or adding new administrators. You can make the fields mandatory or optional, and set the side of the field.
With the fields set as mandatory, administrators must supply additional information when they create a new FortiGate object, such as an administrator account or firewall policy. Fields for this new information are added to the FortiGate unit dialog boxes in the locations where you create these objects. You can also provide fields for optional additional information.
The one exception to this is the Administrators system object. This object applies only to administrators on the FortiManager unit. All other objects are related to FortiGate units.