diff --git a/Documentation/backends.md b/Documentation/backends.md
index 020c37c021..de08e1a7b4 100644
--- a/Documentation/backends.md
+++ b/Documentation/backends.md
@@ -173,6 +173,7 @@ Type:
 * `Type` (string): `wireguard`
 * `PSK` (string): Optional. The pre shared key to use. Use `wg genpsk` to generate a key.
 * `ListenPort` (int): Optional. The udp port to listen on. Default is `51820`.
+* `ListenPortV6` (int): Optional. The udp port to listen on for ipv6. Default is `51821`.
 * `PersistentKeepaliveInterval` (int): Optional. Default is 0 (disabled).
 
 If no private key was generated before the private key is written to `/run/flannel/wgkey`. You can use environment `WIREGUARD_KEY_FILE` to change this path.
diff --git a/dist/extension-wireguard b/dist/extension-wireguard
index 42d99c24eb..738b0b904c 100644
--- a/dist/extension-wireguard
+++ b/dist/extension-wireguard
@@ -1,3 +1,4 @@
+// This is deprecated and should not be used. Please use the wireguard backend instead!
 {
   "Network": "10.50.0.0/16",
   "Backend": {