diff --git a/README.md b/README.md
index 7c8ecf2df7ddafc06578f644853548a2983c1d39..2524aa34f00338c37533816501b11d34b64da59f 100644
--- a/README.md
+++ b/README.md
@@ -14,3 +14,7 @@ Simple API-Server to save the state of quests in workadventure
 This project uses [dotent](https://github.com/motdotla/dotenv#readme) so you can have a `.env` file or pass config to it via environment variables.
 
 The variables and their defaults are listed in [`src/config.ts`](./src/config.ts)
+
+# Deploy with docker
+
+The docker image listens on port 4000 (unencrypted HTTP). Data is saved in `/usr/app/data`.