-An FS::cust_bill object represents an invoice. FS::cust_bill inherits from
-FS::Record. The following fields are currently supported:
+An FS::cust_bill object represents an invoice; a declaration that a customer
+owes you money. The specific charges are itemized as B<cust_bill_pkg> records
+(see L<FS::cust_bill_pkg>). FS::cust_bill inherits from FS::Record. The
+following fields are currently supported: