diff --git a/README.md b/README.md
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@@ -2,4 +2,6 @@
 
 This is a Dockerfile for the [OwnTracks Recorder](https://github.com/owntracks/recorder) which includes the [Mosquitto broker](http://mosquitto.org) as well as the Recorder proper. Documentation for running this is in the [Booklet](http://owntracks.org/booklet/clients/recorder/).
 
+It sets Mosquitto broker (with TLS) as well as the OwnTracks Recorder for collecting [OwnTracks](http://owntracks.org) location data.
+
 Images are built automatically when we push to the `recorder` repository, and they are available at [https://hub.docker.com/r/owntracks/recorderd/](https://hub.docker.com/r/owntracks/recorderd/).