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diff --git a/man/systemd-sysusers.xml b/man/systemd-sysusers.xml
index cc026256990..1e5853a55b8 100644
--- a/man/systemd-sysusers.xml
+++ b/man/systemd-sysusers.xml
@@ -68,6 +68,19 @@
         paths. </para></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>--image=<replaceable>image</replaceable></option></term>
+
+        <listitem><para>Takes a path to a disk image file or block device node. If specified all operations
+        are applied to file system in the indicated disk image. This is similar to <option>--root=</option>
+        but operates on file systems stored in disk images or block devices. The disk image should either
+        contain just a file system or a set of file systems within a GPT partition table, following the
+        <ulink url="https://systemd.io/DISCOVERABLE_PARTITIONS">Discoverable Partitions
+        Specification</ulink>. For further information on supported disk images, see
+        <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
+        switch of the same name.</para></listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><option>--replace=<replaceable>PATH</replaceable></option></term>
         <listitem><para>When this option is given, one ore more positional arguments