Need advice on using DUB registry

[Eric via Digitalmars-d-learn]

I'm planning on some day putting a package in the DUB registry.  
My package
is dependent on my "util" package which is a collection of stuff 
I use across
all my projects.  Does this mean I also have to put my util 
package in the DUB registry?
Could I just make "util" a git sub module of the package I want 
to release?