1. Entropy and information causality in general probabilistic theories. Author Barnum, Howard, Barrett, Jonathan, Clark, Lisa Orloff, Leifer, Matthew, Spekkens, Robert, Stepanik, Nicholas, Wilce, Alex, and Wilke, Robin Subjects *EQUALITY, *PAPER, *ELEMENTARY schools, *PHYSICS, *PHYSICAL sciences Abstract In this addendum to our paper (2010 New J. Phys. 12 033024), we point out that an elementary consequence of the strong subadditivity inequality allows us to strengthen one of the main conclusions of that paper. [ABSTRACT FROM AUTHOR] Published 2012 Full Text View/download PDF