This document summarizes a discussion of a paper that examines whether humanitarian aid crowds out development aid using dynamic panel data analysis. The discussant notes that the paper found a small crowding-in effect of humanitarian aid on development aid, contrary to expectations. Issues raised for consideration include the channels through which humanitarian aid may impact development aid, differences in how countries define and report humanitarian aid expenditures, and potential methodological issues around the use of a gravity model framework, treatment of zero values, endogeneity, and choice of instruments.