diff --git a/src/mame/drivers/ertictac.c b/src/mame/drivers/ertictac.c
index 748417c4594..8a823c05e28 100644
--- a/src/mame/drivers/ertictac.c
+++ b/src/mame/drivers/ertictac.c
@@ -7,6 +7,7 @@
 
 	original driver by Tomasz Slanina, Steve Ellenoff, Nicola Salmoria
 	rewrite to use AA functions by R.Belmont & Angelo Salese
+	special thanks to Tom Walker (author of the Acorn Archimedes Arculator emulator)
 
 	TODO (specific issues only):
 	- Sound is currently ugly in both games, recognizable but still nowhere near perfection