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diff --git a/ReferenceCode/AcpiTables/SampleCode/Lpit/LowPowerIdleTable.h b/ReferenceCode/AcpiTables/SampleCode/Lpit/LowPowerIdleTable.h
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+++ b/ReferenceCode/AcpiTables/SampleCode/Lpit/LowPowerIdleTable.h
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+/** @file
+
+This file defines the Low Power Idle Table definition, defined by
+Intel IA-PC LPIT (Low Power Idle Table) Specification draft.
+
+@copyright 
+Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>
+This software and associated documentation (if any) is furnished
+under a license and may only be used or copied in accordance
+with the terms of the license. Except as permitted by such
+license, no part of this software or documentation may be
+reproduced, stored in a retrieval system, or transmitted in any
+form or by any means without the express written consent of
+Intel Corporation.
+This file contains an 'Intel Peripheral Driver' and is
+licensed for Intel CPUs and chipsets under the terms of your
+license agreement with Intel or your vendor. This file may
+be modified by the user, subject to additional terms of the
+license agreement
+
+**/
+
+#ifndef _LOW_POWER_IDLE_TABLE_H_
+#define _LOW_POWER_IDLE_TABLE_H_
+
+//
+// Include files
+//
+#include "Acpi2_0.h"
+
+//
+// LPIT Definitions
+//
+
+#define EFI_ACPI_LOW_POWER_IDLE_TABLE_REVISION 0x1
+
+//
+// Ensure proper structure formats
+//
+#pragma pack(1)
+
+typedef union _EFI_ACPI_LPI_STATE_FLAGS {
+  struct {
+    UINT32 Disabled           :1;
+    UINT32 CounterUnavailable :1;
+    UINT32 Reserved           :30;
+  };
+  UINT32 AsUlong;
+} EFI_ACPI_LPI_STATE_FLAGS, *PEFI_ACPI_LPI_STATE_FLAGS;
+
+// Only Mwait LPI here:
+
+typedef struct _EFI_ACPI_MWAIT_LPI_STATE_DESCRIPTOR {
+  UINT32 Type;        // offset: 0
+  UINT32 Length;      // offset: 4
+  UINT16 UniqueId;    // offset: 8
+  UINT8 Reserved[2]; // offset: 10
+  EFI_ACPI_LPI_STATE_FLAGS Flags; // offset: 12
+  EFI_ACPI_2_0_GENERIC_ADDRESS_STRUCTURE EntryTrigger; // offset: 16
+  UINT32 Residency;  // offset: 28
+  UINT32 Latency; // offset: 32
+  EFI_ACPI_2_0_GENERIC_ADDRESS_STRUCTURE ResidencyCounter; // offset: 36
+  UINT64 ResidencyCounterFrequency; //offset: 48
+} EFI_ACPI_MWAIT_LPI_STATE_DESCRIPTOR;
+
+#pragma pack()
+
+#endif //_LOW_POWER_IDLE_TABLE_H_