diff --git a/docs/configure_mqtt.md b/docs/configure_mqtt.md
index b8454fd3..3a22cdd9 100644
--- a/docs/configure_mqtt.md
+++ b/docs/configure_mqtt.md
@@ -32,6 +32,7 @@ appdaemon:
   longitude: 4.0
   elevation: 2
   time_zone: Europe/Berlin
+  app_dir: /homeassistant/appdaemon/apps/ # !!! This is really important for AppDaemon HA Addon >= 15
   plugins:
     HASS:
       type: hass