diff --git a/README.md b/README.md
index 2b81f6e..006be47 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,14 @@ Install python requirements
 python -m pip installl -r requirements.txt
 ```
 
+Environment (`.env`)
+```sh
+POSTGRES_URL=0.0.0.0
+POSTGRES_USER=rgraph
+POSTGRES_PASSWORD=rgraph
+POSTGRES_DB=rgraph
+```
+
 Start database
 ```sh
 docker-compose up