Capitalization of "PL/pgSQL"

I happened to notice this while reading the 9.0 release notes. Most
places, "PL/pgSQL" is capitalized (correctly?) like so:
  $ find postgresql/ | xargs grep "PL/pgSQL" | wc -l
     476

But I also see a decent number of references to this alternate capitalization:
  $ find postgresql/ | xargs grep "PL/PgSQL" | wc -l
     55

I always assumed "PL/pgSQL" was correct, but does anyone know for
sure? Anyone interested in making consistent all these mentions of
PL/pgSQL in the source (I can send in a patch if needed)?

Josh