[Exim] RBL logging

exim 4.10
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Although I know a mail msg was rejected by the dnslists ACL
(the sender complained), I didnt get a message in the exim log.
The exim bible says that in the absence of a 'log_message' modifier,
'message' is used, but I get nowt. Do I need to explicitly
set a log_message modifier here? (Nothing changes in
the output from an exim -bh run if I do).



ACL fragment:

deny    message       = rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text
        dnslists      = rbl-plus.mail-abuse.ja.net

TIA,
Terry.