diff --git a/source/_docs/mqtt/broker.markdown b/source/_docs/mqtt/broker.markdown
index 87406a587367..47a19df934fb 100644
--- a/source/_docs/mqtt/broker.markdown
+++ b/source/_docs/mqtt/broker.markdown
@@ -31,6 +31,13 @@ Home Assistant contains an embedded MQTT broker. If no broker configuration is g
 mqtt:
 ```
 
+<p class='note warning'>
+There is an issue with the HBMQTT broker that can cause a memory leak (slowly increasing used memory). This causes an unstable system after the memory is full. You could measure/monitor this with a system monitor. The issue is from 2016 and could already be resolved with newer versions. Use another broker when you experience this issue, for example, Mosquitto. <br>
+<br>
+Issue with the HBMQTT broker: https://github.com/beerfactory/hbmqtt/issues/62  <br>
+System monitor: https://www.home-assistant.io/components/sensor.systemmonitor/
+</p>
+
 ### {% linkable_title Owntracks%}
 
 To use Owntracks with the internal broker a small configuration change must be made in order for the app to use MQTT protocol 3.1.1 (Protocol Level 4).