diff --git a/Makefile b/Makefile
index 634fc88..17bf763 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ dev:
 	FLASK_APP=dev.py bin/flask run -p 8000
 
 prod:
-	bin/gunicorn -c gunicorn_config.py wsgi:app
+	bin/gunicorn -c gunicorn_config.py production:app
 
 deploy_lambda:
 	pipenv run pip install --target ./lambda_function/package -r lambda_function/requirements.txt
diff --git a/README.md b/README.md
index cf6fbc4..c0a5e0b 100644
--- a/README.md
+++ b/README.md
@@ -72,3 +72,28 @@ If you need to run the server with ssl cert, add these rows:
 certfile = "/path/to/ssl/certfile.pem"
 keyfile = "path/to/ssl/privkey.pem"
 ```
+
+## certbot
+
+install certbot:
+
+    > apt-get install certbot
+
+or on mac:
+
+    > brew install certbot
+
+Make sure that you open ports on your router for letsencrypt connections:
+
+- local port: 4080 - public port: 80
+- local port: 4443 - public port: 443
+
+Then you can generate a new certificate and chain file:
+
+    > certbot certonly --standalone -d your_domain --http-01-port 4080 --tls-sni-01-port 4443
+
+To renew cert, run:
+
+    > certbot renew
+
+or re-generate certificates