diff --git a/doc/config-reference/block-storage/drivers/emc-vnx-direct-driver.xml b/doc/config-reference/block-storage/drivers/emc-vnx-direct-driver.xml
index 7b916346ec..6bb9fbe693 100644
--- a/doc/config-reference/block-storage/drivers/emc-vnx-direct-driver.xml
+++ b/doc/config-reference/block-storage/drivers/emc-vnx-direct-driver.xml
@@ -571,10 +571,10 @@ storage_vnx_authentication_type = ldap</programlisting>
     </section>
     <section xml:id="emc-vnx-direct-ro-vol">
         <title>Read-only volumes</title>
-        <para>OpenStack supports read-only volumes. Either of the following
-            commands can be used to set a volume to read-only.</para>
-        <screen><prompt>$</prompt> <userinput>cinder metadata volume set 'attached_mode'='ro'</userinput>
-<prompt>$</prompt> <userinput>cinder metadata volume set 'readonly'='True'</userinput></screen>
+        <para>OpenStack supports read-only volumes. The following
+            command can be used to set a volume to read-only.</para>
+        <screen><prompt>$</prompt> <userinput
+            >cinder readonly-mode-update volume True</userinput></screen>
         <para>After a volume is marked as read-only, the driver will forward
             the information when a hypervisor is attaching the volume and the
             hypervisor will have an implementation-specific way to make sure