> For the complete documentation index, see [llms.txt](https://docs.finngen.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.finngen.fi/faq/about-endpoints/why-is-there-a-k.-prefix-on-some-endpoints.md).

# Why is there a "K." prefix on some endpoints?

We often use the K. prefix (from *kuolinsyyrekisteri*, the death registry) to denote that the endpoint represents death due to the disease.

K (from *kuolema*) means “death due to”. When endpoint follow-up is done, all endpoints are formed using only a specific registry (the death registry, in the case of K\* endpoints). These intermediate data are dropped from the final endpoint files to keep file size to a minimum.