Critical comments of Shpotyuk et al. [O. Shpotyuk, J. Filipecki, M. Hyla, A. Ingram, Solid State Ionics 208 (2012) 1] are shown to be inconsistent with the experimental results obtained for a size of free-volume defects in ion-conducting Ag/AgI-As2S3 glasses in view of a new formula for positron lifetime tau(2) versus radius of voids R for R<5 angstrom, discovered by Liao et al. [K-S. Liao, H. Chen, S. Awad, J.-P. Yuan, W.-S. Hung, K.-R. Lee, J.-Y. Lai, C-C. Hu, Y.C. Jean, Macromolecules 44 (2011) 6818]. In particular, the statement that only voids with volume similar to 80-100 angstrom(3) can be effective positron traps with more prolonged lifetimes of tau(2) = 0.35-0.38 ns is at least inconclusive in terms of a new approach. The experimental results and schematic model reported by Kavetskyy et al. [T. Kavetskyy, J. Borc, P. Petkov, K. Kolev, T. Petkova, Solid State Ionics 183 (2011) 16] are a direct evidence of validity of a newly modified equation for tau(2)-R correlation in the case of inorganic polymeric chalcogenide glasses without orthopositronium component in positron annihilation lifetime spectroscopy. (C) 2012 Elsevier B.V. All rights reserved.