  How much information is added to the Review of Particle Physics when a new
decay branching ratio of a hadron is measured and reported? This is
quantifiable by Shannon's information entropy $S(i)
=-\sum_{f}BR_{(i\longrightarrow f)}\log BR_{(i\longrightarrow f)}$ that takes
as input the experimental branching ratios (BR) of the decay distribution of
particle i.
  It may be used at two levels, against the distribution of decay-channel
probabilities, or against the distribution of individual quantum-state
probabilities (integrating the phase space of those states provides the
former). We illustrate the concept with some examples.
