diff --git a/MdePkg/Include/Protocol/DiskIo2.h b/MdePkg/Include/Protocol/DiskIo2.h
index a6badf231a..6e0665b1dc 100644
--- a/MdePkg/Include/Protocol/DiskIo2.h
+++ b/MdePkg/Include/Protocol/DiskIo2.h
@@ -1,9 +1,8 @@
 /** @file
-  Disk IO protocol as defined in the UEFI 2.0 specification.
+  Disk I/O 2 protocol as defined in the UEFI 2.4 specification.
 
-  The Disk IO2 protocol is used to convert block oriented devices into byte
-  oriented devices. The Disk IO protocol is intended to layer on top of the
-  Block IO protocol.
+  The Disk I/O 2 protocol defines an extension to the Disk I/O protocol to enable
+  non-blocking / asynchronous byte-oriented disk operation.
 
   Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials