  Very recently Tang et al. [Bull Iran Math Soc (2019)
doi:10.1007/s41980-019-00262-y] have studied some majorization results for two
certain subclasses of the starlike functions associated with the sine and
cosine functions defined by $\mathcal{S}^*_s$ and $\mathcal{S}^*_c$,
respectively. In this note we pointed out that the definition of the class
$\mathcal{S}^*_c$ and it's result are incorrect and give correct definition and
result.
