diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index 4818f3423c4..6b28dc57699 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -2628,6 +2628,13 @@ StandardInputData=SWNrIHNpdHplIGRhIHVuJyBlc3NlIEtsb3BzLAp1ZmYgZWVtYWwga2xvcHAncy
         </para></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><varname>$LOG_NAMESPACE</varname></term>
+
+        <listitem><para>If the <varname>LogNamespace=</varname> service setting is used, contains name of the
+        selected logging namespace.</para></listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><varname>$JOURNAL_STREAM</varname></term>