diff --git a/MdeModulePkg/Library/DxePerformanceLib/DxePerformanceLib.c b/MdeModulePkg/Library/DxePerformanceLib/DxePerformanceLib.c
index febf05991a..5fb3ff2264 100644
--- a/MdeModulePkg/Library/DxePerformanceLib/DxePerformanceLib.c
+++ b/MdeModulePkg/Library/DxePerformanceLib/DxePerformanceLib.c
@@ -6,7 +6,7 @@
   to log performance data. If Performance Protocol is not available, it does not log any
   performance information.
 
-  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -116,7 +116,6 @@ StartPerformanceMeasurement (
   then TimeStamp is added to the record as the end time.
   If the record is found and TimeStamp is zero, then this function reads
   the current time stamp and adds that time stamp value to the record as the end time.
-  If this function is called multiple times for the same record, then the end time is overwritten.
 
   @param  Handle                  Pointer to environment specific context used
                                   to identify the component being measured.
diff --git a/MdeModulePkg/Library/DxeSmmPerformanceLib/DxeSmmPerformanceLib.c b/MdeModulePkg/Library/DxeSmmPerformanceLib/DxeSmmPerformanceLib.c
index 3b0a9f6271..19e9877cbf 100644
--- a/MdeModulePkg/Library/DxeSmmPerformanceLib/DxeSmmPerformanceLib.c
+++ b/MdeModulePkg/Library/DxeSmmPerformanceLib/DxeSmmPerformanceLib.c
@@ -4,7 +4,7 @@
   This library instance allows a DXE driver or UEFI application to dump the SMM performance data.
   StartPerformanceMeasurement() and EndPerformanceMeasurement() are not implemented.
 
-  Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2011 - 2012, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -116,7 +116,6 @@ StartPerformanceMeasurement (
   then TimeStamp is added to the record as the end time.
   If the record is found and TimeStamp is zero, then this function reads
   the current time stamp and adds that time stamp value to the record as the end time.
-  If this function is called multiple times for the same record, then the end time is overwritten.
 
   @param  Handle                  Pointer to environment specific context used
                                   to identify the component being measured.
diff --git a/MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.c b/MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.c
index 190ffe63a8..3b6a44c9b2 100644
--- a/MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.c
+++ b/MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.c
@@ -6,7 +6,7 @@
   performance data to the GUIDed HOB. Due to the limitation of temporary RAM, the maximum
   number of performance logging entry is specified by PcdMaxPeiPerformanceLogEntries.  
 
-Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -197,7 +197,6 @@ StartPerformanceMeasurement (
   then TimeStamp is added to the record as the end time.
   If the record is found and TimeStamp is zero, then this function reads
   the current time stamp and adds that time stamp value to the record as the end time.
-  If this function is called multiple times for the same record, then the end time is overwritten.
 
   @param  Handle                  Pointer to environment specific context used
                                   to identify the component being measured.
diff --git a/MdeModulePkg/Library/SmmPerformanceLib/SmmPerformanceLib.c b/MdeModulePkg/Library/SmmPerformanceLib/SmmPerformanceLib.c
index 106155984a..3644824e7b 100644
--- a/MdeModulePkg/Library/SmmPerformanceLib/SmmPerformanceLib.c
+++ b/MdeModulePkg/Library/SmmPerformanceLib/SmmPerformanceLib.c
@@ -6,7 +6,7 @@
   to log performance data. If Performance Protocol is not available, it does not log any
   performance information.
 
-  Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2011 - 2012, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -145,7 +145,6 @@ StartPerformanceMeasurement (
   then TimeStamp is added to the record as the end time.
   If the record is found and TimeStamp is zero, then this function reads
   the current time stamp and adds that time stamp value to the record as the end time.
-  If this function is called multiple times for the same record, then the end time is overwritten.
 
   @param  Handle                  Pointer to environment specific context used
                                   to identify the component being measured.