diff --git a/README.md b/README.md
index 70b608e..7faf553 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,7 @@
 
 [![Go Reference](https://pkg.go.dev/badge/git.tebibyte.media/tomo/tomo.svg)](https://pkg.go.dev/git.tebibyte.media/tomo/tomo)
 
-Tomo is a lightweight GUI toolkit written in pure Go.
+Tomo is a lightweight GUI toolkit written in pure Go. This repository defines
+the API that other components of the toolkit agree on. In order to use Tomo in
+an application, use [Nasin](https://git.tebibyte.media/tomo/nasin), which builds
+an application framework on top of Tomo.