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+<?xml version="1.0"?>
+<!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+<refentry id="systemd-update-done.service">
+
+  <refentryinfo>
+    <title>systemd-update-done.service</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>systemd-update-done.service</refentrytitle>
+    <manvolnum>8</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>systemd-update-done.service</refname>
+    <refname>systemd-update-done</refname>
+    <refpurpose>Mark <filename>/etc/</filename> and <filename>/var/</filename> fully updated</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <para><filename>systemd-update-done.service</filename></para>
+    <para><filename>/usr/lib/systemd/systemd-update-done</filename></para>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><filename>systemd-update-done.service</filename> is a
+    service that is invoked as part of the first boot after the vendor
+    operating system resources in <filename>/usr/</filename> have been
+    updated. This is useful to implement offline updates of
+    <filename>/usr/</filename> which might require updates to
+    <filename>/etc/</filename> or <filename>/var/</filename> on the
+    following boot.</para>
+
+    <para><filename>systemd-update-done.service</filename> updates the
+    file modification time (mtime) of the stamp files
+    <filename>/etc/.updated</filename> and
+    <filename>/var/.updated</filename> to the modification time of the
+    <filename>/usr/</filename> directory, unless the stamp files are
+    already newer.</para>
+
+    <para>Services that shall run after offline upgrades of
+    <filename>/usr/</filename> should order themselves before
+    <filename>systemd-update-done.service</filename>, and use the
+    <varname>ConditionNeedsUpdate=</varname> (see
+    <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>)
+    condition to make sure to run when <filename>/etc/</filename> or
+    <filename>/var/</filename> are older than <filename>/usr/</filename>
+    according to the modification times of the files described above.
+    This requires that updates to <filename>/usr/</filename> are always
+    followed by an update of the modification time of
+    <filename>/usr/</filename>, for example by invoking
+    <citerefentry project='man-pages'><refentrytitle>touch</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    on it.</para>
+
+    <para>Note that if the <varname>systemd.condition-needs-update=</varname> kernel command line option is
+    used it overrides the <varname>ConditionNeedsUpdate=</varname> unit condition checks. In that case
+    <filename>systemd-update-done.service</filename> will not reset the condition state until a follow-up
+    reboot where the kernel switch is not specified anymore.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>touch</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>