diff --git a/pi_mqtt_gpio/__init__.py b/pi_mqtt_gpio/__init__.py
index 5d1e1d2360494cd49a1f130ad23caf1ba38c5a1b..f3d999a73501eb3440da5c45419d937deb7ba5a0 100644
--- a/pi_mqtt_gpio/__init__.py
+++ b/pi_mqtt_gpio/__init__.py
@@ -24,6 +24,10 @@ mqtt:
       type: string
       required: no
       default: ""
+    client_id:
+      type: string
+      required: no
+      default: ""
     topic_prefix:
       type: string
       required: no