diff --git a/BaseTools/ReadMe.txt b/BaseTools/ReadMe.txt
index 841d1c4ba5..6ad748e78d 100644
--- a/BaseTools/ReadMe.txt
+++ b/BaseTools/ReadMe.txt
@@ -26,7 +26,8 @@ Notes:
    after you call "nmake cleanall", you have to call "build" command to rebuild platform
 	 or modules because the AutoGen.* files have been be removed. The "makefile" itself
 	 cannot generate AutoGen.* files. Only "build" command can.
-3) All .exe binary file including C and python tools are generated from r1623.
+3) All .exe binary file including C and python tools are generated from:
+    r1623 <buildtools_project>\BaseTools\Source\Python\
 	
 Brief usage for Migration Tool MigrationMsa2Inf.exe:
 1. Command line format: