diff --git a/README.md b/README.md
index 50649cf..39322b4 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,3 @@
-
 # 📦 Minimal Requirements & Installation Guide
 
 ----
@@ -28,7 +27,33 @@ cd docker-compose-selfhost
 
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-3. Pull the Docker images
+3. Edit your environment variables
+* Open the .env file and adjust configurations only before the first boot.
+#### Most importantly:
+```bash
+# ====== Phoenix Super Admin Configuration ======
+SUPER_ADMIN_USER_PASSWORD=your-secure-password-here
+```
+
+#### You can also configure other services like database, pgAdmin, mail server, and Redis in this same .env file.
+Example:
+```bash
+NODE_ENV=production
+POSTGRES_PASSWORD="8*6&Ti3TJxN^"
+PGADMIN_DEFAULT_EMAIL="info@phx-erp.de"
+PGADMIN_DEFAULT_PASSWORD="8*6&Ti3TJxN^"
+SUPER_ADMIN_USER_PASSWORD=123
+```
+
+⚠️ IMPORTANT: ONE-TIME SETTING ONLY
+
+🛑 The .env variable SUPER_ADMIN_USER_PASSWORD is only used on the first boot to create the super admin user.
+
+After the system has been started once:
+* Depending on what you changing it can break the system.
+* To change the super admin password, use the Phoenix ERP UI directly (under Admin settings).
+
+4. Pull the Docker images
 
 Run:
 ```bash
@@ -38,7 +63,7 @@ docker compose pull
 
 ----
 
-4. Set pgAdmin data folder permissions
+5. Set pgAdmin data folder permissions
 
 To ensure pgAdmin can access its persistent storage, run:
 ```bash