diff --git a/examples/MQ-8/MQ-8.ino b/examples/MQ-8/MQ-8.ino
index 59537b3..ccc6869 100644
--- a/examples/MQ-8/MQ-8.ino
+++ b/examples/MQ-8/MQ-8.ino
@@ -46,7 +46,8 @@ void loop() {
   // Options, uncomment where you need
   //int lecture =  MQ8.readSensor("H2", true); // Return CH4 concentration
   //int lecture =  MQ8.readSensor("LPG", true); // Return LPG concentration
-  //int lecture =  MQ8.readSensor("CH4", true); // Return CO concentration
-  //int lecture =  MQ8.readSensor("CO", true); // Return Alcohol concentration
-  //int lecture =  MQ8.readSensor("Alcohol", true); // Return smoke concentration
+  //int lecture =  MQ8.readSensor("CH4", true); // Return CH4 concentration
+  //int lecture =  MQ8.readSensor("CO", true); // Return CO concentration
+  //int lecture =  MQ8.readSensor("Alcohol", true); // Return Alcohol concentration
+  delay(400);
 }