Duplicate content with forwarding from TLD to different 'start page'

I came across something interesting today.

See this site.

Notice that the TLD automatically forwards to /about-alc/. This is because, the home section is actually called 'About ALC'.

I recently used a site map generator, and it said 'Duplicate content' for the TLD and the /about-alc/

Is this not a开发者_开发问答 good approach? Should I just throw a canonical meta tag in there and that will be enough?

Thanks

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The canonical tags are the way to go if you insist on remain redirecting to that subpage. I'd rather use a different start site under /, just to be able to pack more keyword-laden text into the site.