Do I need to credit you when using your (free) sounds ?

Use all my sounds at your own liberty. My ears are everywhere and nowhere and I'll know my children when I hear them muhahahahaha.... OK, all silliness aside, it would be greatly appreciated when you would make a credit line if you make videos containing my sound but it's not required. Ofcourse in audio material such as commercials it's a bit silly to start crediting me :)