diff --git a/README.md b/README.md
index 9f9cc0b..6dc5c50 100644
--- a/README.md
+++ b/README.md
@@ -24,3 +24,18 @@ To test locally, set `NODE_ENV=test`, or just remove the env var.
 
   - `docker-compose up`
   - Go to `http://localhost:8080/ghost/`. Create admin account if 1st time. Then go to Settings -> Advanced -> Lab -> Import and upload `output/blog.zip`.
+
+3. Configuration
+There should be a .env file (for testing purpose) in the root of the project to configure host and s3. The file should look like this:
+
+```bash
+BLOG_HOST=http://localhost:8080
+BLOG_STORAGE=s3
+BLOG_STORAGE_ACCESS_KEY_ID=AccessKeyId
+BLOG_STORAGE_SECRET_ACCESS_KEY=SecretAccessKey
+BLOG_STORAGE_REGION=Region
+BLOG_STORAGE_BUCKET=Bucket
+BLOG_STORAGE_ASSET_HOST=Url to access the files leading with //
+BLOG_STORAGE_ENDPOINT=Endpoint without the protocol and bucket
+```
+When running for production, the .env.production file should be in the root of the project.