[Zope] Adding Role Programmatically

Hello all, This is probably simple, but I'm unable to find anything on it. I'm trying to add a new role to a new folder using a Python script, and am using - context.manage_addFolder(fldr, folders[fldr], 1, 1) # folders is a dictionary # create a new folder named 'fldr' newFolder = getattr(context, fldr) # create reviewer role in folder newFolder.manage_addRole('Reviewer') The last line generates the following error - Line 20: "_addRole" is an invalid attribute name because it starts with "_". I've looked at the source code in Roles.py but can't find an alternative. What should I be doing here? Is there any documentation on this (I can't find anything in the Zope Book either). TIA Samir