diff --git a/meshtastic/telemetry.proto b/meshtastic/telemetry.proto
index deece46..51c0d48 100644
--- a/meshtastic/telemetry.proto
+++ b/meshtastic/telemetry.proto
@@ -716,6 +716,11 @@ enum TelemetrySensorType {
    * ADS1X15 ADC
    */
   ADS1X15 = 40;
+
+  /*
+   * ADS1X15 ADC_ALT
+   */
+  ADS1X15_ALT = 41;
 }
 
 /*