diff --git a/source/_components/light.mqtt.markdown b/source/_components/light.mqtt.markdown
index e92f859fb7c..b7ca1ff13a5 100644
--- a/source/_components/light.mqtt.markdown
+++ b/source/_components/light.mqtt.markdown
@@ -35,6 +35,10 @@ name:
   required: false
   type: string
   default: MQTT Light
+unique_id:
+  description: An ID that uniquely identifies this light. If two lights have the same unique ID, Home Assistant will raise an exception.
+  required: false
+  type: string
 command_topic:
   description: The MQTT topic to publish commands to change the switch state.
   required: true