openssh unix dev - Jun 2001 - openssh-2.9p2: scp: usage message does not mention -o option

$ scp --invalid--  somehost:somefile .
scp: invalid option -- -
usage: scp [-pqrvBC46] [-S ssh] [-P port] [-c cipher] [-i identity] f1 f2
   or: scp [options] f1 ... fn directory


The -o option is not mentioned.