diff --git a/sinks/adsb-ws/README.md b/sinks/adsb-ws/README.md
index a82c805..9841941 100644
--- a/sinks/adsb-ws/README.md
+++ b/sinks/adsb-ws/README.md
@@ -2,6 +2,8 @@
 
 adsb-ws takes an ADS-B feed and makes it available via [websockets](https://en.wikipedia.org/wiki/WebSocket) (written in Go)
 
+This exposes data from adsbus to HTTP clients. It allows you to write clients that consume the data entirely in JavaScript.
+
 ## Use
 
 Pass `--exec-send=json=/path/to/adsb-ws` to [adsbus](../../adsbus/).