arduino/Arduino — pull request #92 by Lauszus (2012-06-02 18:12:02+00:00)
Title: Added support for interrupt on INT2 and INT3 on the Leonardo

You might also want to update the following page: http://arduino.cc/it/Reference/AttachInterrupt, so people know that they can't use external interrupt 2 and 3 and the Serial1 class at the same time.
Also a small text about the location of the interrupt pins might be useful for beginners.