  We show that the deviation from exponential behavior of the diffraction cone
observed near t=-0.1 GeV^2 both at ISR and the LHC (so-called break) follows
from a two-pion loop in the t channel, imposed by unitarity. By using a simple
Regge-pole model, we extrapolate the "break" from the ISR energy region to that
of the LHC.
