We value the indication of your Source for making changes to the details of a ring, and appreciate any Comments that are relevant to a submission. However in very recent weeks we have been experiencing occasional loss of submissions (which means that we also lose the supporting information), and at a rate which is noticeably higher than anything hitherto experienced. If you do make such additions to a pNBR submission, please make we ask that you keep a copy - until such time as you receive our normal acknowledgement which invariably reproduces what is actually received or recoverable.