diff --git a/source/_integrations/sensor.mqtt.markdown b/source/_integrations/sensor.mqtt.markdown
index 87a5c37e5ed..b3566daaf68 100644
--- a/source/_integrations/sensor.mqtt.markdown
+++ b/source/_integrations/sensor.mqtt.markdown
@@ -65,7 +65,7 @@ device_class:
   type: device_class
   default: None
 expire_after:
-  description: Defines the number of seconds after the value expires if it's not updated.
+  description: Defines the number of seconds after the sensor's state expires, if it's not updated. After expiry, the sensor's state becomes `unavailable`.
   required: false
   type: integer
   default: 0