1. A recently published review of guidelines [2] suggests that all except the Endocrine Society Clinical Practice Guideline (used by authors) [3] agreed upon cutoff of 20 ng/mL as sufficient, and same cut-off has been endorsed by Indian Academy of Pediatrics (IAP) [4]. Recent literature suggests that the cut-off of 20 ng/mL is more appropriate as it coincides with the level that would cover the needs of 97.5 percent of the population [4]. Adherence to the standard cutoff is very necessary as increasing the cut-off will greatly affect the prevalence rate of insufficiency and will increase the treatment rate. In this study, 93% of the uncontrolled group were deficient as per cut-off of 30 ng/mL. It will be useful to reanalyze the data with revised definitions and to see whether the association is real.

2. In results, there is no mention of the p-value/ 95% confidence interval (CI) for the association of the vitamin D deficiency/ insufficiency with asthma control. From clinical as well as statistical point of view, it is important to give Odds ratio with 95% CI in case-control studies.

3. There is no mention of the sample size in the manuscript. As the sample size is small, the study may not be powered for the given conclusion.

4. Authors should have collected and compared data on vitamin D supplementation among the groups. Beyond the age of one year, IAP recommends routine supplementation of 600 IU vitamin D/day [4].Therefore, it will be important to know the number of children on vitamin D supplementation and still have vitamin D deficiency/insufficiency.

5. There are several reasons for poor control of asthma, including poor inhalation technique, poor compliance to therapy, and presence of comorbidities [5]. In this study, allergic rhinitis which is an important asthma comorbidity was prevalent in children in whom asthma was not well-controlled.

6. Authors should have considered to establish relationship between vitamin D level and some objective parameter for asthma control such as pulmonary function test.