The authors performed a series of laser ablation experiments to severe kinetochores fibers in U2OS and PtK1 cells, they assed the role of bridging fibers for maintaining the interkinetochore tension by tacking the interkinetochore distance before and after cut. The authors elegantly demonstrated the importance of bridging microtubules in the maintanace of interkinetochore tension. The manuscript is technically very strong. However, the difference between this work and (Kajtez et al., 2016) is not clear. Kajtez et al., 2016 has performed for both Hela and PtK1 cells. Therefore the novelty that was provided by this manuscript is not clear. The experimental design is not sufficient for the microtubule length-dependent tension generation conclusion. The statement should be adjusted accordingly.