diff --git a/MdePkg/ChangeLog.txt b/MdePkg/ChangeLog.txt
index 68de80c0f8..e3329ad0d2 100644
--- a/MdePkg/ChangeLog.txt
+++ b/MdePkg/ChangeLog.txt
@@ -151,4 +151,18 @@ EDK_5869:  Non-Compatible: qhuang8
 			The macro ALIGN_VARIABLE in base.h is changed to keep the first paramter
 
 		Possible Impacts:
-			Modules using this macro, it needs to adapt to new interface.
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+			Modules using this macro, it needs to adapt to new interface.
+			
+EDK_5939:  Non-Compatible: qwang12
+  Library API moved frrom HiiLib to UefiLib.
+  
+		Code Change:
+			Change HiiLibGetCurrentLanguage to GetCurrentLanguage and moved it from HiiLib to UefiLib.
+
+		Possible Impacts:
+			All module that reference HiiLibGetCurrentLanguage should be updated in the following step:
+			  0) Change HiiLibGetCurrentLanguage to GetCurrentLanguage.
+				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.
+				
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