/usr/share/zsh/5.5.1/functions
Edit: /usr/share/zsh/5.5.1/functions/_run-help (209B)
#compdef run-help
local d expl
local HELPDIR=${HELPDIR:-/usr/share/zsh/5.5.1/help}
[[ -d $HELPDIR ]] && {
d=($HELPDIR/*(:t))
(($#d)) && d+=('.' ':') && _wanted commands expl 'command' compadd -a d
} || _man