diff --git a/zigbee2mqtt/README.md b/zigbee2mqtt/README.md
index 0d3ea51..00e79c9 100644
--- a/zigbee2mqtt/README.md
+++ b/zigbee2mqtt/README.md
@@ -58,6 +58,8 @@ mqtt:
   #password: '!secret.yaml password'
 serial:
   port: /dev/ttyACM0
+advanced:
+  last_seen: epoch
 availability: true
 ```