Where do cultural notes go in visual novel translations?

[DragonmasterX]

In anime, I've seen cultural notes at the top of the screen while the subtitles are displayed on the bottom. I think I've also seen them at the beginning and end of episodes.

But where can cultural notes be placed in visual novel translations? I've only played them in Japanese, so anyone that's played them in English have an idea?

I'm playing Kanon - Nayuki Route, Janary 25 morning. Nayuki's mom says "Maybe we should have red rice for dinner tonight." Nayuki blushes to this comment. Among Japanese people, the fact that red rice is consumed on happy occassions like birthdays, weddings, graduation ceremonies, etc. is common knowledge. But the average Westerner probably doesn't know that. Where would a cultural note about the meaning of red rice go?