'How to set up Watchtower update my containers from private registry?

I have my own private Docker registry, so my plan is to set up Watchtower to auto update my containers from my registry once I build the new version in Jenkins. I have 6 containers there. How I can do that? Where to define my registry? Thanks in advance!

docker run -d \
>   --name watchtower \
>   -e REPO_USER=X \
>   -e REPO_PASS=X \


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