Should enum GUCs be listed as such in config.sgml?

Currently, config.sgml still describes the new "enum" GUC variables
as being of type "string" --- but pg_settings says they are "enum".
This is not very consistent, but I wonder whether changing the docs
would be more confusing or less so.  I note that section 18.1 doesn't
mention the enum alternative either.
        regards, tom lane