diff --git a/machine.cfg b/machine.cfg
index 306ce47..ea08383 100644
--- a/machine.cfg
+++ b/machine.cfg
@@ -210,6 +210,7 @@ cycle_time: 0.010
 # Other Sensors
 #####################################################################
 
+##   Chamber Temp Sensor - Z-STOP
 [temperature_sensor chamber]
 sensor_type: NTC 100K beta 3950
 sensor_pin: Z_STOP
@@ -219,6 +220,15 @@ min_temp: 0
 max_temp: 100
 gcode_id: C
 
+##   Z Extrusion Expansion Sensor - SPI1 (SCK)
+[temperature_sensor frame]
+sensor_type: NTC 100K beta 3950
+sensor_pin: PA5 
+pullup_resistor: 10000
+inline_resistor: 100
+min_temp: 0
+max_temp: 100
+
 
 #####################################################################
 #  Advanced Features