diff --git a/docs/Battery.md b/docs/Battery.md
index 99cb492b8..40dad080b 100644
--- a/docs/Battery.md
+++ b/docs/Battery.md
@@ -47,6 +47,8 @@ Configure min/max cell voltages using the following CLI setting:
 
 `vbat_max_cell_voltage` - maximum voltage per cell, used for auto-detecting battery voltage in 0.1V units, i.e. 43 = 4.3V
 
+`set vbat_warning_cell_voltage` - warning voltage per cell, this triggers battery out alarms, in 0.1V units, i.e. 34 = 3.4V
+
 `vbat_min_cell_voltage` - minimum voltage per cell, this triggers battery out alarms, in 0.1V units, i.e. 33 = 3.3V
 
 e.g.
@@ -54,6 +56,7 @@ e.g.
 ```
 set vbat_scale = 110
 set vbat_max_cell_voltage = 43
+set vbat_warning_cell_voltage = 34
 set vbat_min_cell_voltage = 33
 ```