/usr/src/xtables-addons-2.12/extensions/libxt_dhcpmac.man is in xtables-addons-dkms 2.12-0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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\fB\-\-mac\fP \fIaa:bb:cc:dd:ee:ff\fP[\fB/\fP\fImask\fP]
Matches the DHCP "Client Host" address (a MAC address) in a DHCP message.
\fImask\fP specifies the prefix length of the initial portion to match.
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