Combat zone is now Downtown Crossing. Also missing financial district, Seaport (if you want to split South Boston up [I would]), or at at least combine DTX and Financial into "Downtown". Official neighborhoods: http://www.bostonplans.org/neighborhoods
With all the new residential building in the Seaport, it should probably become its own neighborhood separate from Southie. Maybe west of Congress Street? https://www.boston.gov/neighborhoods.