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diff --git a/nixpkgs/nixos/modules/services/web-apps/nextcloud.xml b/nixpkgs/nixos/modules/services/web-apps/nextcloud.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-nextcloud">
+ <title>Nextcloud</title>
+
+ <para>
+  <link xlink:href="https://nextcloud.com/">Nextcloud</link> is an open-source, self-hostable cloud
+  platform. The server setup can be automated using
+  <link linkend="opt-services.nextcloud.enable">services.nextcloud</link>. A desktop client is packaged
+  at <literal>pkgs.nextcloud-client</literal>.
+ </para>
+
+ <section xml:id="module-services-nextcloud-basic-usage">
+  <title>Basic usage</title>
+  <para>
+   Nextcloud is a PHP-based application which requires an HTTP server
+   (<literal><link linkend="opt-services.nextcloud.enable">services.nextcloud</link></literal> optionally supports
+   <literal><link linkend="opt-services.nginx.enable">services.nginx</link></literal>) and a database
+   (it's recommended to use <literal><link linkend="opt-services.postgresql.enable">services.postgresql</link></literal>).
+  </para>
+  <para>
+    A very basic configuration may look like this:
+<programlisting>{ pkgs, ... }:
+{
+  services.nextcloud = {
+    <link linkend="opt-services.nextcloud.enable">enable</link> = true;
+    <link linkend="opt-services.nextcloud.hostName">hostName</link> = "nextcloud.tld";
+    <link linkend="opt-services.nextcloud.nginx.enable">nginx.enable</link> = true;
+    config = {
+      <link linkend="opt-services.nextcloud.config.dbtype">dbtype</link> = "pgsql";
+      <link linkend="opt-services.nextcloud.config.dbuser">dbuser</link> = "nextcloud";
+      <link linkend="opt-services.nextcloud.config.dbhost">dbhost</link> = "/tmp"; # nextcloud will add /.s.PGSQL.5432 by itself
+      <link linkend="opt-services.nextcloud.config.dbname">dbname</link> = "nextcloud";
+      <link linkend="opt-services.nextcloud.config.adminpassFile">adminpassFile</link> = "/path/to/admin-pass-file";
+      <link linkend="opt-services.nextcloud.config.adminuser">adminuser</link> = "root";
+    };
+  };
+
+  services.postgresql = {
+    <link linkend="opt-services.postgresql.enable">enable</link> = true;
+    <link linkend="opt-services.postgresql.initialScript">initialScript</link> = pkgs.writeText "psql-init" ''
+      CREATE ROLE nextcloud WITH LOGIN;
+      CREATE DATABASE nextcloud WITH OWNER nextcloud;
+    '';
+  };
+
+  # ensure that postgres is running *before* running the setup
+  systemd.services."nextcloud-setup" = {
+    requires = ["postgresql.service"];
+    after = ["postgresql.service"];
+  };
+
+  <link linkend="opt-networking.firewall.allowedTCPPorts">networking.firewall.allowedTCPPorts</link> = [ 80 443 ];
+}</programlisting>
+  </para>
+  <para>
+   The options <literal>hostName</literal> and <literal>nginx.enable</literal> are used internally to configure an
+   HTTP server using <literal><link xlink:href="https://php-fpm.org/">PHP-FPM</link></literal> and <literal>nginx</literal>.
+   The <literal>config</literal> attribute set is used for the <literal>config.php</literal> which is used
+   for the application's configuration.
+   <emphasis>Beware: this isn't entirely pure since the config is modified by the application's runtime!</emphasis>
+  </para>
+  <para>
+    In case the application serves multiple hosts (those are checked with
+    <literal><link xlink:href="http://php.net/manual/en/reserved.variables.server.php">$_SERVER['HTTP_HOST']</link></literal>)
+    those can be added using
+    <literal><link linkend="opt-services.nextcloud.config.extraTrustedDomains">services.nextcloud.config.extraTrustedDomains</link></literal>.
+  </para>
+ </section>
+
+ <section xml:id="module-services-nextcloud-pitfalls-during-upgrade">
+  <title>Pitfalls</title>
+  <para>
+   Unfortunately Nextcloud appears to be very stateful when it comes to managing its own configuration. The
+   config file lives in the home directory of the <literal>nextcloud</literal> user (by default
+   <literal>/var/lib/nextcloud/config/config.php</literal>) and is also used to track several
+   states of the application (e.g. whether installed or not).
+  </para>
+  <para>
+   Right now changes to the <literal>services.nextcloud.config</literal> attribute set won't take effect
+   after the first install
+   (except <literal><link linkend="opt-services.nextcloud.config.extraTrustedDomains">services.nextcloud.config.extraTrustedDomains</link></literal>) since the actual configuration
+   file is generated by the NextCloud installer which also sets up critical parts such as the database
+   structure.
+  </para>
+  <para>
+   <emphasis>Warning: don't delete <literal>config.php</literal>! This file tracks the application's state and a deletion can cause unwanted side-effects!</emphasis>
+  </para>
+  <para>
+   <emphasis>Warning: don't rerun <literal>nextcloud-occ maintenance:install</literal>! This command tries to install the application and can cause unwanted side-effects!</emphasis>
+  </para>
+  <para>
+    The issues are known and reported in <link xlink:href="https://github.com/NixOS/nixpkgs/issues/49783">#49783</link>, for now it's unfortunately necessary to manually work around these issues.
+  </para>
+ </section>
+
+</chapter>