diff --git a/src/mq.py b/src/mq.py
index a33905906322e145c274714c4b582d4ae0f86f9d..e10769a6ca156de204374c4b2e09918cc122d86d 100644
--- a/src/mq.py
+++ b/src/mq.py
@@ -5,6 +5,7 @@ import covid19_worker
 from covid19 import app
 from covid19.blueprints.application.application_workers import celery, run_mq
 
+# Celery: https://docs.celeryproject.org/en/stable/userguide/index.html
 
 # ---------------------------------------------------------------------------------
 #  MAIN