Correct checkmark usage for information

I'm working on a order form where I need to communicate: "By selecting product X, you also get product Y for 5$ extra pr.month"

(in other words, by selecting product X you need to have product Y which you get for an extra fee)

My questions is if its correct usage of a checkmark here (a typical "v") to indicate this text, or are there other icons that can be used here? (see mockup). It's important that the user sees this text.

Thanks!