Not quite sure how to add the path to massdns in the PATH environment variable

[apskis]

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I know this may be obvious for a lot of people but it wasn't for me. I am working on ubuntu 20 and I am not quite sure how to add the path to massdns in the PATH environment variable. Can someone assist?

Do I simply add the following to my ./profile or to ./bashrc? PATH=/usr/local/bin/massdns