Where does this part go?

[ecwx215]

Decided to take out my headlights for a retrofit project (G5-R projectors) and noticed that the rubber line from the washer fluid reservoir practically disintegrated due to dry rotting. I know one end connects to the reservoir but where does the other end go?

Picture for reference:

[Smitsky089]

I think that end is just meant to go to open air, so that the fluid can quickly be filled in the tank.

Similar to...

https://www.youtube.com/watch?v=ZVFm-SGH8wA