diff --git a/source/_components/device_tracker.nmap_scanner.markdown b/source/_components/device_tracker.nmap_scanner.markdown
index e2fad493eaa..de2989900e2 100644
--- a/source/_components/device_tracker.nmap_scanner.markdown
+++ b/source/_components/device_tracker.nmap_scanner.markdown
@@ -27,6 +27,9 @@ device_tracker:
   home_interval: 10
 ```
 
-`home_interval` is an optional value set in minutes.  This will be the number of minutes nmap will not scan this device, assuming it is home, in order to preserve the device battery.
+Configuration variables:
+
+- **hosts** (*Required*): Thenetwork range to scan in CIDR notation, eg. 192.168.1.1/24
+- **home_interval** (*Optional*): The number of minutes nmap will not scan this device, assuming it is home, in order to preserve the device battery.
 
 See the [device tracker component page](/components/device_tracker/) for instructions how to configure the people to be tracked.