diff --git a/README.md b/README.md
index f9558bd..d9f2dbb 100644
--- a/README.md
+++ b/README.md
@@ -78,17 +78,16 @@ Associate one or more IPv4 and IPv6 prefixes to each VLAN. Assign the role `dhcp
 
 ### Devices
 
-For most devices a management interface must be defined to run Ansible scripts, with at least the IP address and default gateway set:
+For most devices a management interface must be defined to run Ansible scripts, with the IP address set:
 
     {
         "name": "eth0", "type": { "value": "1000base-t" },
         "mgmt_only": true,
         "mac_address": "98:03:9B:9C:2D:10",
-        "ip_addresses": [ { "address": "10.20.30.40/24" } ],
-        "custom_fields": { "gateway": { "address": "10.20.30.1/24" } }
+        "ip_addresses": [ { "address": "10.20.30.40/24" } ]
     }
 
-The MAC address is only used in some playbooks to set the interface name.
+This IP address must be set as the primary address for the device. The MAC address is only used in some playbooks to set the interface name.
 
 #### L1 setup