diff --git a/HoymilesZeroExport_Config.ini b/HoymilesZeroExport_Config.ini
index 508300a..fbaa41f 100644
--- a/HoymilesZeroExport_Config.ini
+++ b/HoymilesZeroExport_Config.ini
@@ -229,6 +229,8 @@ AMIS_READER_IP_INTERMEDIATE = xxx.xxx.xxx.xxx
 # MQTT_BROKER = localhost
 # MQTT_PORT = 1883
 # MQTT_CLIENT_ID = HoymilesZeroExport
+# MQTT_USERNAME = <optional username>
+# MQTT_PASSWORD= <optional password>
 
 # The script subscribes to the following topics:
 # - zeropower/set/powermeter_target_point: To change the target point of the powermeter