SOA Minimum comment in "dig" output

Carsten Strotmann cas at
Mon Feb 12 09:22:05 UTC 2018

here is a question I've got during a DNS training, and I still do not
have a good answer:

RFC 2308 "DNS NCACHE" defines the last field of the SOA RR as "the TTL of
negative responses".
; <<   DiG 9.10.3-P4-Ubuntu <<   +noall +answer +multi +cmd soa ;; global options: +cmd         86326 IN SOA ( 2018013002 ; serial
                                 900        ; refresh (15 minutes)
                                 300        ; retry (5 minutes)
                                 604800     ; expire (1 week)
                                 900        ; minimum (15 minutes)
Why is dig still showing the old description "minimum" about the meaning
of the field?
Is there a good answer? This behaviour of "dig" is irritating users.
Best regards

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