diff --git a/config.yaml b/config.yaml
index fdcab2bd..1df4b05f 100644
--- a/config.yaml
+++ b/config.yaml
@@ -114,6 +114,18 @@ options:
           juju-myservice-0
       If you're running multiple environments with the same services in them
       this allows you to differentiate between them.
+  prefer-ipv6:
+    type: boolean
+    default: False
+    description: |
+      If True enables IPv6 support. The charm will expect network interfaces
+      to be configured with an IPv6 address. If set to False (default) IPv4
+      is expected.
+      .
+      NOTE: these charms do not currently support IPv6 privacy extension. In
+      order for this charm to function correctly, the privacy extension must be
+      disabled and a non-temporary address must be configured/available on
+      your network interface.
   # Network configuration options
   # by default all access is over 'private-address'
   os-data-network: