diff --git a/docs/railway.mdx b/docs/railway.mdx
index 21e985f2c..26840c99e 100644
--- a/docs/railway.mdx
+++ b/docs/railway.mdx
@@ -16,7 +16,7 @@ and you configure everything via the `/setup` web wizard.
## One-click deploy
-Deploy on Railway
+Deploy on Railway
After deploy, find your public URL in **Railway → your service → Settings → Domains**.
@@ -55,6 +55,7 @@ Attach a volume mounted at:
Set these variables on the service:
- `SETUP_PASSWORD` (required)
+- `PORT=8080` (required — must match the port in Public Networking)
- `CLAWDBOT_STATE_DIR=/data/.clawdbot` (recommended)
- `CLAWDBOT_WORKSPACE_DIR=/data/workspace` (recommended)
- `CLAWDBOT_GATEWAY_TOKEN` (recommended; treat as an admin secret)