Figure (a) is a typical XRD pattern of MXene. All MXenes have similar XRD pattern with one strong peak at 2 = ~7°, corresponds the (002) plane. Figure (b) and Figure (c) are completely different with Figure (a), and are consistent with the XRD pattern of etched sample obtained by Szuplewska et al (red line pattern in Figure (I) in that paper). Thus those etched samples cannot be Ti2NTx MXene. The XRD patterns of those samples in Figure ) agree well with the pattern of commercial TiN in Figure . All the three patterns can be perfectly indexed by PDF card No. 65-0715 in Figure (e). Therefore, the etched samples in this paper and those in the commented paper are TiN powders with cubic crystal structure. They are NOT Ti2NTx MXene.