diff --git a/include/sensor_multichannelgasgmxxx.h b/include/sensor_multichannelgasgmxxx.h
index c00bb48..8a1d6b7 100644
--- a/include/sensor_multichannelgasgmxxx.h
+++ b/include/sensor_multichannelgasgmxxx.h
@@ -32,10 +32,10 @@ public:
     void setSettings_voc(float minchange, unsigned long senddelaymax, unsigned long readdelay);
     void setSettings_co(float minchange, unsigned long senddelaymax, unsigned long readdelay);
     void advertise(HomieNode& p_sensorNode);
-    void sensorloop_no2();
-    void sensorloop_c2h5oh();
-    void sensorloop_voc();
-    void sensorloop_co();
+    void sensorloop_no2(); // GM-102B Nitrogen Dioxide
+    void sensorloop_c2h5oh(); //GM-302B Ethyl Alcohol
+    void sensorloop_voc(); // GM-502B Volatile Organic Compounds
+    void sensorloop_co(); // GM-702B Carbon Monoxide
     
 };
 
diff --git a/include/sensor_vl53l1x.cpp b/include/sensor_vl53l1x.cpp
index 18821ed..e39a608 100644
--- a/include/sensor_vl53l1x.cpp
+++ b/include/sensor_vl53l1x.cpp
@@ -67,13 +67,15 @@ void Sensor_VL53L1X::sensorloop()
       Serial.print(vl53l1x.ranging_data.ambient_count_rate_MCPS);
       Serial.println();
       */
-
-      if (abs((int)d.lastsentvalue-d.value)>=d.minchange){  //int abs
-        _changed=true;
+     //&& VL53L1X::rangeStatusToString(vl53l1x->ranging_data.range_status)=="range valid"
+      if (abs((int)d.lastsentvalue-d.value)>=d.minchange ){  //int abs
+        if (vl53l1x->ranging_data.range_status==0) { // "0 is range valid"
+          _changed=true;
+        }
       }
-      if (lastsentvalue_vl53l1x_status!=vl53l1x->ranging_data.range_status) { //sensor status changed
+      /*if (lastsentvalue_vl53l1x_status!=vl53l1x->ranging_data.range_status) { //sensor status changed
         _changed=true;
-      }
+      }*/
       d.lastreadtime=millis();
     }