diff --git a/ampel-firmware/co2_sensor.cpp b/ampel-firmware/co2_sensor.cpp
index e2eb1a2e382d54767615094d0255b8296259cb7d..261e5a341f85395701d76f24c31d2f334ee32f58 100644
--- a/ampel-firmware/co2_sensor.cpp
+++ b/ampel-firmware/co2_sensor.cpp
@@ -158,12 +158,14 @@ namespace sensor {
     switchState(PREPARE_CALIBRATION_UNSTABLE);
   }
 
-  void calibrateAndRestart() {
+  void calibrate() {
     Serial.print(F("Calibrating SCD30 now..."));
     scd30.setAltitudeCompensation(config::altitude_above_sea_level);
     scd30.setForcedRecalibrationFactor(config::co2_calibration_level);
     Serial.println(F(" Done!"));
     Serial.println(F("Sensor calibrated."));
+    //WARNING: Do not reset the ampel or the SCD30!
+    //At least one measurement needs to happen in order for the calibration to be correctly applied.
   }
 
   void logToSerial() {
@@ -209,7 +211,7 @@ namespace sensor {
       // leave them before calibration is done.
       bool ready_for_calibration = countStableMeasurements();
       if (ready_for_calibration) {
-        calibrateAndRestart();
+        calibrate();
       }
     } else if (co2 < 250) {
       // Sensor should be calibrated.
@@ -325,7 +327,7 @@ namespace sensor {
       config::co2_calibration_level = calibrationLevel;
       Serial.print(config::co2_calibration_level);
       Serial.println(F(" ppm."));
-      calibrateAndRestart();
+      calibrate();
     }
   }