diff --git a/README.md b/README.md
index 81f3ffe..5073e04 100644
--- a/README.md
+++ b/README.md
@@ -111,7 +111,7 @@ Once you installed the script on your raspberry you need to create some sensors
 If you are using ```discovery_messages```, then this step is not required as a new MQTT device will be automatically created in Home Assistant and all you need to do is add it to a dashboard.
 
 This is the sensors configuration if ```group_messages = True``` assuming your sensors are separated in ```sensors.yaml``` file.
-```yaml{r, attr.source='.numberLines'}
+```{r, attr.source='.numberLines'}
   - platform: mqtt
     name: 'rpi4 cpu load'
     state_topic: 'masoko/rpi4'