diff --git a/README.md b/README.md
index 4412a85..7a2b263 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ sensor:
     prometheus_query: temperature{location="Pisa",province="PI",region="Tuscany"}
     unit_of_measurement: "°C"
     state_class: total_increasing
+    device_class: measurement
 ```
 
 ### Configuration Variables