diff --git a/doc/flatpak-update.xml b/doc/flatpak-update.xml
index 79237d1e7..b76dd624c 100644
--- a/doc/flatpak-update.xml
+++ b/doc/flatpak-update.xml
@@ -161,6 +161,14 @@
                 </para></listitem>
             </varlistentry>
 
+            <varlistentry>
+                <term><option>--appstream</option></term>
+
+                <listitem><para>
+                    Update appstream for the remote.
+                </para></listitem>
+            </varlistentry>
+
             <varlistentry>
                 <term><option>--runtime</option></term>