diff --git a/param-docs/parameter-pages/MQTT/MainTopic.md b/param-docs/parameter-pages/MQTT/MainTopic.md
index 9fde7b0..3cf12ec 100644
--- a/param-docs/parameter-pages/MQTT/MainTopic.md
+++ b/param-docs/parameter-pages/MQTT/MainTopic.md
@@ -14,3 +14,5 @@ With:
 The general connection status can be found in `MAINTOPIC/CONNECTION`. 
 See [MQTT Result Topics](../MQTT-API#result) for a full list of topics.
 
+!!! Note
+    The main topic is allowed to contain `/` which can be used to split it into multiple levels, eg. `/basement/meters/watermeter/1/` if you have multiple water meters in your basement.