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

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.