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diff --git a/man/systemd-cat.xml b/man/systemd-cat.xml
index 72cd196c4e5..f3d6f3785fd 100644
--- a/man/systemd-cat.xml
+++ b/man/systemd-cat.xml
@@ -1,10 +1,7 @@
 <?xml version='1.0'?> <!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+<!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+
--->
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
 
 <refentry id="systemd-cat"
     xmlns:xi="http://www.w3.org/2001/XInclude">
@@ -92,6 +89,29 @@
         see <option>--level-prefix=</option> below.</para></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>--stderr-priority=</option></term>
+
+        <listitem><para>Specifies the default priority level for
+        messages from the process's standard error output (stderr).
+        Usage of this option is the same as the
+        <option>--priority=</option> option, above, and both can be
+        used at once. When both are used, <option>--priority=</option>
+        will specify the default priority for standard output (stdout).
+        </para>
+
+        <para>If <option>--stderr-priority=</option> is not specified,
+        messages from stderr will still be logged, with the same
+        default priority level as stdout.</para>
+
+        <para>Also, note that when stdout and stderr use the same
+        default priority, the messages will be strictly ordered,
+        because one channel is used for both. When the default priority
+        differs, two channels are used, and so stdout messages will not
+        be strictly ordered with respect to stderr messages - though
+        they will tend to be approximately ordered.</para></listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><option>--level-prefix=</option></term>