diff --git a/src/mame/drivers/mpu3.cpp b/src/mame/drivers/mpu3.cpp
index ed6787c1105..18333f24c5c 100644
--- a/src/mame/drivers/mpu3.cpp
+++ b/src/mame/drivers/mpu3.cpp
@@ -1,5 +1,6 @@
 // license:BSD-3-Clause
 // copyright-holders:James Wallace
+// thanks-to:Chris Wren, Tony Friery, MFME
 /* Notes 17/07/11 DH
  added most other MPU3 sets