Android - Should res/assets be marked as source?

I am just starting android development and the first thing that I noticed about the example project is that the res and assets directories are not marked as source.
I took this application as a starting point
It has an html file in the assets dir and is accessed like this:

        //provide the URL path pointing to info.html

The info.html doesn't auto-complete in the editor as resources normally do in java applications.
Is this because the assets dir is not marked as source in the project setup?

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