diff --git a/MdePkg/ChangeLog.txt b/MdePkg/ChangeLog.txt
index e3329ad0d2..ec4b0f372e 100644
--- a/MdePkg/ChangeLog.txt
+++ b/MdePkg/ChangeLog.txt
@@ -165,4 +165,16 @@ EDK_5939:  Non-Compatible: qwang12
 				1) Add UefiLib to [LibraryClass] in INF if it is not included before.
 				2) Remove HiiLib from [LibraryClass] if HiiLibGetCurrentLanguage is the only API from original HiiLib referenced by this module.
 				3) Add UefiLib to [LibraryClasses.common.Module Type] for the affected module if UefiLib is not in the list.
+				
+EDK_5989:  Non-Compatible: qwang12
+  Library API name changed:
+   In IfrSupportLib,
+	 Rename BufToHexString to BufInReverseOrderToHexString 
+   Rename HexStringToBuf to HexStringToBufInReverseOrder
+
+Possible Impacts:
+			All module that reference BufToHexString or HexStringToBuf should be updated in the following step:
+			  0) Change HiiLibGetCurrentLanguage to GetCurrentLanguage.
+				1) Change BufToHexString to BufInReverseOrderToHexString 
+			  2) Change HexStringToBuf to HexStringToBufInReverseOrder
 				
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