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diff --git a/infra/libkookie/nixpkgs/nixos/modules/services/desktops/flatpak.xml b/infra/libkookie/nixpkgs/nixos/modules/services/desktops/flatpak.xml
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+<chapter 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="module-services-flatpak">
+ <title>Flatpak</title>
+ <para>
+  <emphasis>Source:</emphasis>
+  <filename>modules/services/desktop/flatpak.nix</filename>
+ </para>
+ <para>
+  <emphasis>Upstream documentation:</emphasis>
+  <link xlink:href="https://github.com/flatpak/flatpak/wiki"/>
+ </para>
+ <para>
+  Flatpak is a system for building, distributing, and running sandboxed desktop
+  applications on Linux.
+ </para>
+ <para>
+  To enable Flatpak, add the following to your
+  <filename>configuration.nix</filename>:
+<programlisting>
+  <xref linkend="opt-services.flatpak.enable"/> = true;
+</programlisting>
+ </para>
+ <para>
+  For the sandboxed apps to work correctly, desktop integration portals need to
+  be installed. If you run GNOME, this will be handled automatically for you;
+  in other cases, you will need to add something like the following to your
+  <filename>configuration.nix</filename>:
+<programlisting>
+  <xref linkend="opt-xdg.portal.extraPortals"/> = [ pkgs.xdg-desktop-portal-gtk ];
+</programlisting>
+ </para>
+ <para>
+  Then, you will need to add a repository, for example,
+  <link xlink:href="https://github.com/flatpak/flatpak/wiki">Flathub</link>,
+  either using the following commands:
+<screen>
+<prompt>$ </prompt>flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+<prompt>$ </prompt>flatpak update
+</screen>
+  or by opening the
+  <link xlink:href="https://flathub.org/repo/flathub.flatpakrepo">repository
+  file</link> in GNOME Software.
+ </para>
+ <para>
+  Finally, you can search and install programs:
+<screen>
+<prompt>$ </prompt>flatpak search bustle
+<prompt>$ </prompt>flatpak install flathub org.freedesktop.Bustle
+<prompt>$ </prompt>flatpak run org.freedesktop.Bustle
+</screen>
+  Again, GNOME Software offers graphical interface for these tasks.
+ </para>
+</chapter>