diff --git a/JSON-dictionary.md b/JSON-dictionary.md
index b792568..e415417 100644
--- a/JSON-dictionary.md
+++ b/JSON-dictionary.md
@@ -6,6 +6,7 @@ i.e. {"name1":value1,"name2":value2}
 Only actual value changes are transmitted to minimise traffic.  
 However, whenever a new client attaches to the ESP32, every client will receive the full set of information.  
 i.e. every time a client connects, they will always get the complete status of the heater, then only changes to the values, unless another user connects.
+Some parameters are only sent upon being requested via a "Query" command, eg "MQuery" delivers MQTT setup parameters, "SQuery" delivers system parameters, etc.
 
 The table below documents the JSON names sent between the ESP32 and Bluetooth or WiFi clients.  
 Some commands are bi-directional, others are simply command directives (to ESP32), or status reporting (from ESP32).