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diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml
index 2c8bfbef7..4dc427c30 100644
--- a/man/systemd.unit.xml
+++ b/man/systemd.unit.xml
@@ -656,6 +656,37 @@
                                 settings.</para></listitem>
                         </varlistentry>
 
+                        <varlistentry>
+                                <term><varname>JoinsNamespaceOf=</varname></term>
+
+                                <listitem><para>For units that start
+                                processes (such as service units),
+                                lists one or more other units whose
+                                network and/or temporary file
+                                namespace to join. This only applies
+                                to unit types which support the
+                                <varname>PrivateNetwork=</varname> and
+                                <varname>PrivateTmp=</varname>
+                                directives (see
+                                <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+                                for details). If a unit that has this
+                                setting set is started its processes
+                                will see the same
+                                <filename>/tmp</filename>,
+                                <filename>/tmp/var</filename> and
+                                network namespace as one listed unit
+                                that is started. If multiple listed
+                                units are already started it is not
+                                defined which namespace is
+                                joined. Note that this setting only
+                                has an effect if
+                                <varname>PrivateNetwork=</varname>
+                                and/or <varname>PrivateTmp=</varname>
+                                is enabled for both the unit that
+                                joins the namespace and the unit whose
+                                namespace is joined.</para></listitem>
+                        </varlistentry>
+
                         <varlistentry>
                                 <term><varname>RequiresMountsFor=</varname></term>