... and you forgot the circumflex.
The circumflex is not part of the English language and it is not needed in this now English phrase.
You're just trying to show off, Setanta, you ole pedant.
We borrow words from other languages; we don't borrow the rules that accompany them.
One does not capitalize the "r" or the "d" in raison d'être
Aren't you being more than a bit hypocritical telling the OP what to capitalize and what not to when you don't capitalize what "one does capitalize"?