More precise comment for SCD30.reset()

ampel-firmware/co2_sensor.cpp

@@ -80,9 +80,10 @@ namespace sensor {
       ESP.restart();
     }
 
-    // Sometimes after a hard reset of the ESP the SCD30 needs
-    // a long time until returning the first measurement. Resetting it
-    // after startup seems to fix this behaviour.
+    // Changes of the SCD30's measurement timestep do not come into effect
+    // before the next measurement takes place. That means that after a hard reset
+    // of the ESP the SCD30 sometimes needs a long time until switching back to 2 s
+    // for acclimatization. Resetting it after startup seems to fix this behaviour.
     scd30.reset();
     switchState(BOOTUP);