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<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-meta-attributes">
<title>Meta Attributes</title>
<para>
Like Nix packages, NixOS modules can declare meta-attributes to provide extra information. Module meta attributes are defined in the <filename
xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/misc/meta.nix">meta.nix</filename> special module.
</para>
<para>
<literal>meta</literal> is a top level attribute like <literal>options</literal> and <literal>config</literal>. Available meta-attributes are <literal>maintainers</literal> and <literal>doc</literal>.
</para>
<para>
Each of the meta-attributes must be defined at most once per module file.
</para>
<programlisting>
{ config, lib, pkgs, ... }:
{
options = {
...
};
config = {
...
};
meta = {
maintainers = with lib.maintainers; [ ericsagnes ]; <co
xml:id='modules-meta-1' />
doc = ./default.xml; <co xml:id='modules-meta-2' />
};
}
</programlisting>
<calloutlist>
<callout arearefs='modules-meta-1'>
<para>
<varname>maintainers</varname> contains a list of the module maintainers.
</para>
</callout>
<callout arearefs='modules-meta-2'>
<para>
<varname>doc</varname> points to a valid DocBook file containing the module documentation. Its contents is automatically added to <xref
linkend="ch-configuration"/>. Changes to a module documentation have to be checked to not break building the NixOS manual:
</para>
<programlisting>$ nix-build nixos/release.nix -A manual</programlisting>
</callout>
</calloutlist>
</section>
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