Question about how to signalate a missing dependency for package

[Alessandro Valente <alessandro.valente@zurisee.digital>]

Hello

Really sorry to use this mail to make a technical request, I am really a 
newbie about helping debian, although I use it A LOT.
Simple question how can I signal that a package need forcely a 
dependency, else it doesn't work?
Thanks in advance for your answer.

Ciao
Alessandro