diff --git a/Theremin/Theremin.ino b/Theremin/Theremin.ino
index ce8058a..c4ee885 100644
--- a/Theremin/Theremin.ino
+++ b/Theremin/Theremin.ino
@@ -10,7 +10,7 @@ void setup() {
   pinMode(8, OUTPUT);
   pinMode (7, INPUT_PULLUP);
 
-  
+    pinMode(5, INPUT_PULLUP);
     Serial.begin (9600);        //set up a serial connection with the computer
 
   pinMode(11, OUTPUT);   //the trigger pin 
@@ -25,16 +25,19 @@ void loop() {
     mode = 1;
   }
   float note = 0;
-  if (digitalRead(7) == LOW){
+  if (digitalRead(7) == LOW || digitalRead(5) == LOW){
   if (mode == 0){
     note = tune(getNote());
   }
   else{
     note = getNote();
   }
+  if (digitalRead(5)==LOW){ //if the octave button is pressed
+    note *= 2;
+  }
     digitalWrite(13, HIGH);
-       Serial.print(note);      //print units after the distance
-    Serial.println(" hz");      //print units after the distance
+       Serial.print(note);      //print frequency
+    Serial.println(" hz");      //print units after frequency
     tone(8, note); 
   
   }