diff --git a/JSON-dictionary.md b/JSON-dictionary.md
index c01f4e1..e50eceb 100644
--- a/JSON-dictionary.md
+++ b/JSON-dictionary.md
@@ -27,6 +27,7 @@ Certain commands are used to alter the non volatile settings stored by the contr
 | FanMin | float | RPM | To/From ESP | **YES** | |
 | FanSensor | integer | 1,2 | To/From ESP | **YES** | |
 | FanRPM | integer | RPM | From ESP | n/a | |
+| FanVoltage | float | 0.1V resolution | From ESP | n/a | |
 | GlowCurrent | float | 10mA resolution | From ESP | n/a | |
 | GlowVoltage | float | 0.1V resolution | From ESP | n/a | |
 | GPanlg | int | 0-100 | From ESP | n/a | GPIO analogue input % |