diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -5,6 +5,15 @@ These dashboards show the state of a single station. They are tailored to be ins
 * Locally on a station, through https://git.astron.nl/lofar2.0/tango/-/tree/master/docker-compose/grafana
 * Centrally to monitor a group of stations, through https://git.astron.nl/lofar2.0/operations-central-management/-/tree/main/grafana-central/dashboards
 
+## Datasources
+
+The Grafana installation in this repo exposes and uses the following data sources, as configured in the `dashboards/` directory:
+
+* Prometheus, at `http://prometheus:9090`, serving metrics,
+* Loki, at `http://loki:3100`, serving logs,
+* Alerta, at `http://alerta-server:8080`, serving the Alerta HTTP API,
+* Grafana, serving its own HTTP API.
+
 ## Development
 
 To cover both these use cases, the designer must consider: