diff --git a/doc/flatpak-spawn.xml b/doc/flatpak-spawn.xml
index 04e97c0f..beee6a5b 100644
--- a/doc/flatpak-spawn.xml
+++ b/doc/flatpak-spawn.xml
@@ -94,6 +94,14 @@
                 </para></listitem>
             </varlistentry>
 
+            <varlistentry>
+                <term><option>--watch-bus</option></term>
+
+                <listitem><para>
+                    Make the spawned command exit if we do
+                </para></listitem>
+            </varlistentry>
+
             <varlistentry>
                 <term><option>--env=VAR=VALUE</option></term>