diff --git a/meshtastic/telemetry.proto b/meshtastic/telemetry.proto
index c4d7ea5..94aaf39 100644
--- a/meshtastic/telemetry.proto
+++ b/meshtastic/telemetry.proto
@@ -510,6 +510,13 @@ enum TelemetrySensorType {
    * MAX30102 Pulse Oximeter and Heart-Rate Sensor 
    */
   MAX30102 = 30;
+  
+  /*
+   * MLX90614 non-contact IR temperature sensor.
+   */
+  MLX90614 = 31;
+
+  /*
 }
 
 /*