In the article titled “Phase Singularities to Polarization Singularities” [1], the authors identified an error in the Stokes index equation in Section 6. The equation should read as follows, and the authors confirm that it does not affect the results and conclusion of the article:
Accordingly, the subsequent equation connecting the Stokes index, C-point (IC), and the Poincare´–Hopf index, η, should also be corrected as follows: