diff --git a/source/_components/elkm1.markdown b/source/_components/elkm1.markdown
index 063db11650f..86baa1093c2 100644
--- a/source/_components/elkm1.markdown
+++ b/source/_components/elkm1.markdown
@@ -36,18 +36,21 @@ There is currently support for the following device types within Home Assistant:
 
 ## Configuration
 
-To integrate Elk-M1 controller with Home Assistant, add the following
+To integrate one or more Elk-M1 controllers with Home Assistant, add the following
 section to your `configuration.yaml` file:
 
 ```yaml
 # Example configuration.yaml entry
 elkm1:
-  host: elk://IP_ADDRESS
+  - host: elk://IP_ADDRESS_1
+  ...
+  - host: elk://IP_ADDRESS_2
+    prefix: gh  # for guest house controller
 ```
 
 {% configuration %}
 host:
-  description: Connection string to Elk of the form `<method>://<address>[:port]`. `<method>` is `elk` for non-secure connection, `elks` for secure connection, and `serial` for serial port connection. `<address>` is IP address or domain or for `serial` the serial port that the Elk is connected to. Optional `<port>` is the port to connect to on the Elk, defaulting to 2101 for `elk` and 2601 for `elks`. For `serial` method, _address_ is the path to the tty _/dev/ttyS1_ for example and `[:baud]` is the baud rate to connect with.
+  description: Connection string to Elk of the form `<method>://<address>[:port]`. `<method>` is `elk` for non-secure connection, `elks` for secure connection, and `serial` for serial port connection. `<address>` is IP address or domain or for `serial` the serial port that the Elk is connected to. Optional `<port>` is the port to connect to on the Elk, defaulting to 2101 for `elk` and 2601 for `elks`. For `serial` method, _address_ is the path to the tty _/dev/ttyS1_ for example and `[:baud]` is the baud rate to connect with.  You may have multiple host sections for connecting multiple controllers.
   required: true
   type: string
 username:
@@ -58,6 +61,10 @@ password:
   description: Password to login to Elk. Only required if using `elks` connection method.
   required: false
   type: string
+prefix:
+  description: The prefix to use, if any, for all the devices created for this controller. At most one host can omit the prefix, all others must have a unique prefix within the home assistant instance.
+  require: false
+  type: string
 temperature_unit:
   description: The temperature unit that the Elk panel uses. Valid values are `C` and `F`.
   required: false