diff --git a/COMPATIBILITY b/COMPATIBILITY
index eabd15f..6fb0bce 100644
--- a/COMPATIBILITY
+++ b/COMPATIBILITY
@@ -179,6 +179,7 @@ HP Pavilion ZV5000		(ALPS touchpad)
 IBM ThinkPad R40
 IBM ThinkPad R50
 IBM ThinkPad T30
+IBM ThinkPad T40
 IBM ThinkPad T40p
 IBM ThinkPad T41
 INote 88EPS