Last week, the United Nations’ World Food Programme (WFP) won the Nobel Peace Prize. Their work has no doubt saved the lives of tens of millions of people, and their reports are one of the world’s only sources of data to understand North Korea’s food supply and agriculture.

But still, there are issues with WFP reports, which seem to be missing key considerations about North Korea’s complex food production system.

Here’s what the WFP should be aware of — and what its reports appear to be missing: