In this article, we construct new specific conditions for the asymptotic stability (AS) and boundedness (B) of solutions to nonlinear Volterra integro-differential equations (VIDEs) of first order with a constant retardation. Our analysis is based on the successful construction of suitable Lyapunov-Krasovskii functionals (LKFs). The results of this paper are new, and they improve and complete that can be found in the literature. (C) 2017 The Author. Production and hosting by Elsevier B.V. on behalf of King Saud University.