diff --git a/src/mame/drivers/zaccaria.c b/src/mame/drivers/zaccaria.c
index 990f4276c6e..a20366828eb 100644
--- a/src/mame/drivers/zaccaria.c
+++ b/src/mame/drivers/zaccaria.c
@@ -686,8 +686,7 @@ static MACHINE_DRIVER_START( zaccaria )
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.80)
 
 	/* There is no xtal, the clock is obtained from a RC oscillator as shown in the TMS5220 datasheet (R=100kOhm C=22pF) */
-	/* 565kHz measured on pin 6, however this likely interfered with the RC oscillator. */
-	/* Waiting for proper measure to be taken on pin 3. */
+	/* 162kHz measured on pin 3 20 minutesa fter power on. Clock would then be 162*4=648kHz. */
 	MDRV_SOUND_ADD(TMS5200, 640000)
 	MDRV_SOUND_CONFIG(tms5220_interface)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.80)