diff --git a/README.md b/README.md
index ffef0f5..2b21ee5 100644
--- a/README.md
+++ b/README.md
@@ -124,8 +124,11 @@ The P1 reader should send its data to an MQTT broker. Each message should be in
 }
 ```
 
+This is currently achieved using an ESP32 with ESPhome. Configuration files for the ESP32 setup is included in `esphome/example.yml`.
 
-This is currently achieved using an ESP32 with ESPhome. Configuration files for the ESP32 setup will be added soon.
+## Known limitations
+
+- The Grafana database query for "Actuele import of export" is currently quite slow. It works, but would benefit from optimisation.
 
 ## References