diff --git a/meshtastic/telemetry.proto b/meshtastic/telemetry.proto
index 8b70ade9..b7286ea3 100644
--- a/meshtastic/telemetry.proto
+++ b/meshtastic/telemetry.proto
@@ -800,6 +800,11 @@ enum TelemetrySensorType {
    * BH1750 light sensor
    */
   BH1750 = 45;
+
+  /*
+   * STH21 Temperature and R. Humidity sensor
+   */
+  SHT21 = 46;
 }
 
 /*