diff --git a/README.md b/README.md
index 52ef676..e466b6a 100644
--- a/README.md
+++ b/README.md
@@ -210,5 +210,6 @@ Keep in mind that Wireguard is presently an auxilliary satellite connection poin
 Enabling IPv6 allows you to be more easily/natively reached by IPv6 native clients, such as mobile phones on LTE.  Keep in mind this doesn't switch on IPv6 inside the VPN itself.
 
  * `ipv6_enabled`: Set to `true` to enable IPv6 support. Defaults to `false`.
+ * `internal_address6`: Optional; if unset, SLAAC is used. Specify a static IPv6 address to bind to `internal_interface`.
  * `internal_subnet6`: Optional. Specify a static IPv6 subnet that is associated to your `internal_interface`.
  * `internal_gateway6`: Optional. Specify a static IPv6 gateway that is reachable at your `internal_interface`.