diff --git a/README.md b/README.md
index 4f9aa90..b6a1f01 100644
--- a/README.md
+++ b/README.md
@@ -156,12 +156,15 @@ If you have additional LAN interfaces repeat these steps for each interface exce
 1. Go to _Services > DHCPv6 Server & RA_
 1. Enable DHCPv6 server on interface LAN
 1. Configure a range of ::0001 to ::ffff:ffff:ffff:fffe
-1. Configure a **Prefix Delegation Range** to _64_
+1. Leave **Prefix Delegation Range** _blank_.
+1. Configure a **Prefix Delegation Size** to _64_
 1. Save
 1. Go to the _Router Advertisements_ tab
 1. Configure **Router mode** as _Stateless DHCP_
 1. Save
 
+If you have additional LAN interfaces repeat these steps for each interface.
+
 That's it! Now your clients should be receiving public IPv6 addresses via DHCP6.
 
 # Troubleshooting