diff --git a/README b/README
index 37b91d0..b272a86 100644
--- a/README
+++ b/README
@@ -140,6 +140,7 @@
 Winbond W49F002U
 Winbond W49V002A
 Winbond W49V002FA
+Winbond W39V040FA
 Winbond W39V040A
 Winbond W39V040B
 Winbond W39V080A