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Recently, Hoang et al. (arXiv:1608.05284) reported analysis of theinteraction of relativistic spacecrafts with interstellar medium (ISM, i.e. gasatoms and dust particles) relevant for the Breakthrough starshot initiative(https://breakthroughinitiatives.org/Initiative/3). The main conclusion is thatdust pose much greater threat to the starship than gas atoms. However, analysisused to treat interaction of the spaceship with gas atoms is based on theincorrect use of the Szenes model. Only by proper treatment of the Szenes modelcan be found if the conclusion remains valid - or not. In the following, themain comments we have raised about the paper are listed. Present text is basedon the v2 version of the above mentioned paper [0] that was accepted forpublication in Astophysical Journal.

Comment to: The interaction of relativistic spacecrafts with the interstellar medium