The investigation by Zhizhan Xu et al.of SIOM predicted[1] that it is possible that the lasing in the water window (4.376-2.332nm) will be realized with the Li-like recombination scheme using their high power laser facility. Our calculations show that the wavelengths of the transitions 5f-3d and 5d-3p in Ca17+ and Mn22+ lie at both ends of the water window. The fine levels (n≤12,l≤5) for these two Li-like ions and the radiative transition probabilities between them are calculated.