/usr/src/xtables-addons-1.40/libxt_condition.man is in xtables-addons-dkms 1.40-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | This matches if a specific condition variable is (un)set.
.TP
[\fB!\fP] \fB\-\-condition\fP \fIname\fP
Match on boolean value stored in /proc/net/nf_condition/\fIname\fP.
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