  With the help of transfer entropy, we analyze information flows between
communities of complex networks. We show that the transfer entropy provides a
coherent description of interactions between communities, including non-linear
interactions. To put some flesh on the bare bones, we analyze transfer
entropies between communities of five largest financial markets, represented as
networks of interacting stocks. Additionally, we discuss information transfer
of rare events, which is analyzed by R\'enyi transfer entropy.
