Another improvement.

README.md

@@ -39,8 +39,27 @@ Drupal2WP Toolkit provides an extensible command-line and plugin-based bridge be
 
 ---
 
+
+
 ## 🧰 Installation
 
+### 🔐 Drupal Database Configuration
+
+Drupal2WP Toolkit connects to your Drupal database using WordPress’s native `wpdb` class, with credentials securely managed via **environment variables**.
+
+This approach keeps sensitive connection details out of your codebase and allows flexible configuration across environments (local, staging, production).
+
+#### ✅ Required Environment Variables
+
+Set the following in your server environment or `.env` file:
+
+```env
+DRUPAL_DB_USER=your_drupal_db_username
+DRUPAL_DB_PASS=your_drupal_db_password
+DRUPAL_DB_NAME=your_drupal_db_name
+DRUPAL_DB_HOST=your_drupal_db_host
+```
+
 1. Clone the repository into your WordPress plugins directory:
 
    ```bash