diff --git a/source/_docs/mqtt/broker.markdown b/source/_docs/mqtt/broker.markdown
index da3a79fd2c4..68b1ffa595b 100644
--- a/source/_docs/mqtt/broker.markdown
+++ b/source/_docs/mqtt/broker.markdown
@@ -16,7 +16,9 @@ The recommended setup method is to use the [Mosquitto MQTT broker add-on](https:
 
 <div class='note warning'>
 
-There is [an issue](https://github.com/rabbitmq/rabbitmq-mqtt/issues/154) with the RabbitMQ MQTT Plugin which break MQTT message retention. Don't use the RabbitMQ MQTT plugin, instead use another broker like Mosquitto.
+Neither ActiveMQ MQTT broker nor the RabbitMQ MQTT Plugin are supported, use a known working broker like Mosquitto instead.
+There are [at least two](https://issues.apache.org/jira/browse/AMQ-6360) [issues](https://issues.apache.org/jira/browse/AMQ-6575) with the ActiveMQ MQTT broker which break MQTT message retention.
+There is [an issue](https://github.com/rabbitmq/rabbitmq-mqtt/issues/154) with the RabbitMQ MQTT Plugin which breaks MQTT message retention.
 
 </div>