diff --git a/doc/plinth.xml b/doc/plinth.xml
index ee22c7757..1331e08e1 100644
--- a/doc/plinth.xml
+++ b/doc/plinth.xml
@@ -152,6 +152,14 @@
           </para>
         </listitem>
       </varlistentry>
+      <varlistentry>
+        <term><option>--version</option></term>
+        <listitem>
+          <para>
+            Show the version of FreedomBox and exit.
+          </para>
+        </listitem>
+      </varlistentry>
     </variablelist>
   </refsect1>