diff --git a/nixos/modules/services/desktops/flatpak.nix b/nixos/modules/services/desktops/flatpak.nix
index 23480e652675..024dc65629a8 100644
--- a/nixos/modules/services/desktops/flatpak.nix
+++ b/nixos/modules/services/desktops/flatpak.nix
@@ -6,6 +6,11 @@ with lib;
 let
   cfg = config.services.flatpak;
 in {
+  meta = {
+    doc = ./flatpak.xml;
+    maintainers = pkgs.flatpak.meta.maintainers;
+  };
+
   ###### interface
   options = {
     services.flatpak = {
diff --git a/nixos/modules/services/desktops/flatpak.xml b/nixos/modules/services/desktops/flatpak.xml
new file mode 100644
index 000000000000..d9c8b711c450
--- /dev/null
+++ b/nixos/modules/services/desktops/flatpak.xml
@@ -0,0 +1,53 @@
+<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-services.flatpak.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:
+
+  <programlisting>
+  flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+  flatpak update
+  </programlisting>
+
+  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:
+
+  <programlisting>
+  flatpak search bustle
+  flatpak install flathub org.freedesktop.Bustle
+  flatpak run org.freedesktop.Bustle
+  </programlisting>
+
+  Again, GNOME Software offers graphical interface for these tasks.
+</para>
+</chapter>