diff --git a/README.md b/README.md
index 6daca1b2..77149f1b 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,7 @@ These options can be configured by setting environment variables using `-e KEY="
 | Env | Default | Example | Description |
 | - | - | - | - |
 | `PASSWORD` | - | `foobar123` | When set, requires a password when logging in to the Web UI. |
+| `PORT` | `51821` | `80` | The internal UI port |
 | `WG_HOST` | - | `vpn.myserver.com` | The public hostname of your VPN server. |
 | `WG_PORT` | `51820` | `12345` | The public UDP port of your VPN server. WireGuard will always listen on `51820` inside the Docker container. |
 | `WG_MTU` | `null` | `1420` | The MTU the clients will use. Server uses default WG MTU. |