diff --git a/meshtastic/admin.proto b/meshtastic/admin.proto
index 0259c2a..ef2e25d 100644
--- a/meshtastic/admin.proto
+++ b/meshtastic/admin.proto
@@ -471,6 +471,11 @@ message AdminMessage {
      * Tell the node to reset the nodedb.
      */
     int32 nodedb_reset = 100;
+
+    /*
+     * SCDXX CO2 sensor configuration
+     */
+    SCDXX_config scdxx_config = 102;
   }
 }
 
@@ -575,3 +580,30 @@ message KeyVerificationAdmin {
    */
   optional uint32 security_number = 4;
 }
+
+message SCDXX_config {
+  /*
+    * Set Automatic self-calibration enabled
+    */
+  optional bool set_asc = 1;
+
+  /*
+    * Recalibration target CO2 concentration in ppm (FRC or ASC)
+    */
+  optional uint32 target_co2_conc = 2;
+
+  /*
+    * Reference temperature in degC
+    */
+  optional float temperature = 4;
+
+  /*
+    * Altitude of sensor in meters above sea level. 0 - 3000m (overrides ambient pressure)
+    */
+  optional uint32 altitude = 5;
+
+  /*
+    * Sensor ambient pressure in Pa. 70000 - 120000 Pa (overrides altitude)
+    */
+  optional uint32 ambient_pressure = 6;
+}