/usr/share/zsh/help/command is in zsh-common 5.0.7-5.
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| 1 2 3 4 5 6 7 8 9 10 | command [ -pvV ] simple command
       The simple command argument is  taken  as  an  external  command
       instead  of  a  function  or  builtin  and  is  executed. If the
       POSIX_BUILTINS option is set, builtins will also be executed but
       certain  special  properties of them are suppressed. The -p flag
       causes a default path to be searched instead of that  in  $path.
       With  the  -v flag, command is similar to whence and with -V, it
       is equivalent to whence -v.
       See also the section `Precommand Modifiers'.
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