#compdef co ci rcs
local nm=$compstate[nmatches]
[[ $words[1] = ci || $words[1] = rcs ]] && _files
if [[ $compstate[nmatches] -eq nm && -d RCS && $words[1] != ci ]]; then
local rep
rep=(RCS/$PREFIX*$SUFFIX,v(:t:s/\,v//))
(( $#rep )) && compadd - $rep
fi