diff --git a/man/systemd.mount.xml b/man/systemd.mount.xml
index d18773663fd..ed9ce635f22 100644
--- a/man/systemd.mount.xml
+++ b/man/systemd.mount.xml
@@ -359,6 +359,17 @@
         <varname>Options=</varname> setting in a unit file.</para></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>x-systemd.rw-only</option></term>
+
+        <listitem><para>If a mount operation fails to mount the file system
+        read-write, it normally tries mounting the file system read-only instead.
+        This option disables that behaviour, and causes the mount to fail
+        immediately instead. This option is translated into the
+        <varname>ReadWriteOnly=</varname> setting in a unit file.</para>
+        </listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><option>_netdev</option></term>