nvtop not found in Debian Buster repositories

[svdHero]

I am using "Debian GNU/Linux 10 (buster) x86_64" and have activated the non-free repos in sources.list.
When trying to install nvtop, I get the following output:

svdhero@box:~$ sudo apt install nvtop
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package nvtop

The README.md states that nvtop should be in the Debian repos. What's wrong here?

[svdHero]

Ah. Stupid me! One has to add

contrib non-free

to the sources.list. It is NOT enough to merely add "non-free".

Thanks for the great program that nvtop is. 👍