The increase in the debt of emerging market non-financial firms has been large. This column argues that to understand the risks, if any, it is important to know the state of corporate balance sheets and what firms have actually been doing. In some cases external debt has been issued to substitute more expensive local debt, in others to finance real investment, and in several countries it has been used to exploit carry trade opportunities. In virtually all cases, however, good information on corporate currency mismatches is hard to obtain. There needs to be better information and better reporting if we are to make headway.