  The eigenstate thermalization hypothesis is a compelling conjecture which
strives to explain the apparent thermal behavior of generic observables in
closed quantum systems. Although we are far from a complete analytic
understanding, quantum chaos is often seen as a strong indication that the
ansatz holds true. In this paper, we address the thermalization of energy
eigenstates in the Sachdev-Ye-Kitaev model, a maximally chaotic model of
strongly-interacting Majorana fermions. We numerically investigate eigenstate
thermalization for specific few-body operators in the original SYK model as
well as its $\mathcal{N}=1$ supersymmetric extension and find evidence that
these models satisfy ETH. We discuss the implications of ETH for a
gravitational dual and the quantum information-theoretic properties of SYK it
suggests.
