diff --git a/homeassistant/components/alarmdecoder/binary_sensor.py b/homeassistant/components/alarmdecoder/binary_sensor.py
index 430a4f73262..b5a2a4498c3 100644
--- a/homeassistant/components/alarmdecoder/binary_sensor.py
+++ b/homeassistant/components/alarmdecoder/binary_sensor.py
@@ -81,6 +81,9 @@ class AlarmDecoderBinarySensor(BinarySensorEntity):
         self._relay_addr = relay_addr
         self._relay_chan = relay_chan
         self._attr_device_class = zone_type
+        self._attr_extra_state_attributes = {
+            CONF_ZONE_NUMBER: self._zone_number,
+        }
 
     async def async_added_to_hass(self):
         """Register callbacks."""