diff --git a/BaseTools/ChangeLog.txt b/BaseTools/ChangeLog.txt
index 8dad4cc093..d1f6079ad6 100644
--- a/BaseTools/ChangeLog.txt
+++ b/BaseTools/ChangeLog.txt
@@ -38,6 +38,18 @@ EDK_0000: Compatible: owner
 !!!!!!!!!!!!!!!!!!                     End of Notes                     !!!!!!!!!!!!!!!!!!
 ##########################################################################################
 
+==========================================================================================
+EDK_3947: Compatible: jwang36
+
+      Class_BuildTool:
+        1) Improved spawn mode (multi-thread) build performance (build -s)
+				2) Changed the error/debug/warning message format
+				3) Added "--log" command line option to support storing log in file
+ 
+        Code Change :
+        1) BaseTools/Bin/Win32/build.exe
+
+
 ==========================================================================================
 EDK_3936: Compatible: klu2