我如何获得有关zsh内置的帮助消息？

如果我想获得内置bash的简短用法消息，可以help <builtin>在命令提示符下使用，例如

$ help export
export: export [-fn] [name[=value] ...] or export -p
    Set export attribute for shell variables.

    Marks each NAME for automatic export to the environment of subsequently
    executed commands.  If VALUE is supplied, assign VALUE before exporting.

    Options:
      -f        refer to shell functions
      -n        remove the export property from each NAME
      -p        display a list of all exported variables and functions

    An argument of `--' disables further option processing.

    Exit Status:
    Returns success unless an invalid option is given or NAME is invalid.

如何在zsh中执行此操作？我试过了

% export --help
zsh: bad option: -e

和

% help export
zsh: command not found: help

此外，“帮助”一词也不在中man zshbuiltins。

感谢@don_crissti通过Arch维基文档链接。
由于某种原因，Arch Wiki上的代码会在调用时导致此错误

/home/velour/.zshrc:unalias:368：无此类哈希表元素：运行帮助

_{zsh --version => zsh 5.1.1（x86_64-ubuntu-linux-gnu）}

为了使其正常工作，我在下方添加了以下代码块~/.zshrc，然后注释掉了别名命令。

autoload -Uz run-help
autoload -Uz run-help-git
autoload -Uz run-help-svn
autoload -Uz run-help-svk
#unalias run-help
#alias help=run-help

并简单地用

run-help <builtin>

所以现在我明白了

% run-help export

export [ name[=value] ... ]
       The specified names are marked for automatic export to the envi-
       ronment  of subsequently executed commands.  Equivalent to type-
       set -gx.  If a parameter specified does not already exist, it is
       created in the global scope.