diff --git a/doc/config-reference/block-storage/drivers/hp-3par-driver.xml b/doc/config-reference/block-storage/drivers/hp-3par-driver.xml
index 33594822f6..3f09ff67f1 100644
--- a/doc/config-reference/block-storage/drivers/hp-3par-driver.xml
+++ b/doc/config-reference/block-storage/drivers/hp-3par-driver.xml
@@ -18,7 +18,7 @@
         <para>
             <itemizedlist>
                 <listitem>
-                    <para>HP 3PAR Operating System software version 3.1.2 or higher</para>
+                    <para>HP 3PAR Operating System software version 3.1.2 (MU2) or higher</para>
                 </listitem>
                 <listitem>
                     <para>HP 3PAR Web Services API Server must be enabled and running</para>