diff --git a/zwave/DOCS.md b/zwave/DOCS.md
index f2989f7..effd07f 100644
--- a/zwave/DOCS.md
+++ b/zwave/DOCS.md
@@ -17,6 +17,7 @@ Add-on configuration:
 ```yaml
 device: /dev/ttyUSB0
 network_key: 
+instance: 1
 ```
 
 ### Option `device`
@@ -25,6 +26,12 @@ network_key:
 ### Option `network_key`
 
 
+### Option `instance`
+
+Zwave instance number as reported to MQTT.  This corresponds with the
+`instance_id` attribute of `ozw` services in Home Assistant.
+
+
 ## Known issues and limitations
 
 - You hardware need to be compatible with OpenZwave library
@@ -46,4 +53,4 @@ In case you've found a bug, please [open an issue on our GitHub][issue].
 [discord]: https://discord.gg/c5DvZ4e
 [forum]: https://community.home-assistant.io
 [issue]: https://github.com/home-assistant/hassio-addons/issues
-[reddit]: https://reddit.com/r/homeassistant
\ No newline at end of file
+[reddit]: https://reddit.com/r/homeassistant
diff --git a/zwave/config.json b/zwave/config.json
index 2705cc0..6c13c70 100644
--- a/zwave/config.json
+++ b/zwave/config.json
@@ -15,7 +15,7 @@
   },
   "ports_description": {
     "1983/tcp": "ozw-admin port"
-  },  
+  },
   "services": ["mqtt:want"],
   "discovery": ["ozw"],
   "auto_uart": true,
@@ -29,7 +29,8 @@
   },
   "schema": {
     "device": "str",
-    "network_key": "password"
+    "network_key": "password",
+    "instance": "int(1,)"
   },
   "image": "homeassistant/{arch}-addon-zwave"
 }
diff --git a/zwave/rootfs/etc/services.d/zwave/run b/zwave/rootfs/etc/services.d/zwave/run
index f12e1b8..82bccde 100644
--- a/zwave/rootfs/etc/services.d/zwave/run
+++ b/zwave/rootfs/etc/services.d/zwave/run
@@ -5,6 +5,9 @@
 OZW_CONFIG=/data/ozw/config
 OZW_NETWORK_KEY=$(bashio::config 'network_key')
 OZW_DEVICE=$(bashio::config 'device')
+bashio::config.has_value 'instance' \
+    && OZW_INSTANCE="$(bashio::config 'instance')" || OZW_INSTANCE=1
+
 MQTT_PASSWORD="$(bashio::jq /data/auth.json ".ozw_password")"
 
 # Wait until mosqitto is up and running
@@ -24,5 +27,5 @@ exec ozwdaemon \
     --mqtt-server 127.0.0.1 \
     --mqtt-port 1883 \
     --mqtt-username ozw \
-    --mqtt-instance 1 \
+    --mqtt-instance "${OZW_INSTANCE}" \
     --stop-on-failure