diff --git a/msg_broker_rabbit_mq_example/exampleReceiver.py b/msg_broker_rabbit_mq_example/exampleReceiver.py
index 8ed2b7a..52a1328 100644
--- a/msg_broker_rabbit_mq_example/exampleReceiver.py
+++ b/msg_broker_rabbit_mq_example/exampleReceiver.py
@@ -1,5 +1,6 @@
 import pika, sys, os
 
+# see https://www.rabbitmq.com/tutorials/tutorial-one-python.html
 
 def main():
     connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
diff --git a/msg_broker_rabbit_mq_example/exampleSender.py b/msg_broker_rabbit_mq_example/exampleSender.py
index 4b6baa4..fee4de4 100644
--- a/msg_broker_rabbit_mq_example/exampleSender.py
+++ b/msg_broker_rabbit_mq_example/exampleSender.py
@@ -1,5 +1,7 @@
 import pika
 
+# see https://www.rabbitmq.com/tutorials/tutorial-one-python.html
+
 connection = pika.BlockingConnection(
     pika.ConnectionParameters(host='localhost'))
 channel = connection.channel()