diff --git a/PCbuild/BUILDno.txt b/PCbuild/BUILDno.txt
index 5c9af5b1714..9bc83b0ad1b 100644
--- a/PCbuild/BUILDno.txt
+++ b/PCbuild/BUILDno.txt
@@ -33,6 +33,8 @@ How to change the Windows build number:
 
 Windows Python BUILD numbers
 ----------------------------
+  51    2.3.3
+        19-Dec-2003
   50    2.3.3c1
         5-Dec-2003
   49    2.3.2 (final)