diff --git a/src/database.py b/src/database.py
index 1553a35ddbfba1b6b8c9809795278d3ec329c3b0..1a2e6f888f827188ef05bdc9e263c2ebb85c84ff 100644
--- a/src/database.py
+++ b/src/database.py
@@ -12,6 +12,7 @@ from celery import Celery
 from celery.utils.log import LoggingProxy
 
 # https://flask-caching.readthedocs.io/en/latest/
+# https://www.howtoforge.de/anleitung/wie-installiere-ich-memcached-auf-ubuntu-2004-lts/
 
 cache = Cache(config={"CACHE_TYPE": "simple"})
 app_cors = CORS()