It is very gratifying to find that my ideas have found an echo, and to see them well applied in a very useful and interesting article, such as that by Ronny Vollandt on “Arabic multi-block Bibles” in the previous issue of the Comparative Oriental Manuscript Studies Newsletter. On the other hand it is mortifying to see that some of them were not perfectly understood, surely because I had failed to be sufficiently clear and explicit in explaining them. I may add that, after my Dutch and English texts had been published, I found a handy criterion to help in deciding whether two groups of quires are to be considered codicological units (CU) or just blocks within a CU: if one of the two were absent, would you be surprised? If they were in different order, or there was something between them, would you think that strange? If no, they are CUs; if yes, they are blocks.