diff --git a/app/Dockerfile b/app/Dockerfile
index ca6615c..302f94a 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -1,3 +1,5 @@
+# https://testdriven.io/blog/dockerizing-django-with-postgres-gunicorn-and-nginx/
+
 FROM python:3.12.2-slim-buster as builder
 
 WORKDIR /usr/src/app