diff --git a/docs/assets/js/UI/ui.js b/docs/assets/js/UI/ui.js
index 5a8175a..de9eb84 100644
--- a/docs/assets/js/UI/ui.js
+++ b/docs/assets/js/UI/ui.js
@@ -25,32 +25,42 @@ function drawEndUI() {
 function rectUI() {};
 
 //Heart rate monitor history 
-var heartBeatHistory = []
+let heartBeatHistory = []
     heartBeatHistory.length = constants.ui.heartRate.history_length;
     heartBeatHistory.fill(0);
 
 //Shift accumulation
-var shiftAccum = 0;
+let shiftAccum = 0;
 
 //Beat progression
-var beatTimeElapsed = 0;
+let beatTimeElapsed = 0;
 
 // Draw heartbeat UI
 function heartBeatUI(x, y, width, height){
 
+    //Shift monitor over once a full scrolling unit is accumulated
     shiftAccum += constants.ui.heartRate.scroll_speed;
     if(shiftAccum>=1){
         shiftAccum%=1;
         beatTimeElapsed += 0.04;
+
+        //Remove oldest value
         heartBeatHistory.shift();
+
+        //Append new value
         pushNextBeatValue();
     }
 
-    if(timeSinceLastBeat===0){
+    //If heart is beaten, reset beat timer.
+    if(heartBeat){
         beatTimeElapsed = 0;
+        heartBeat = false;
     }
 
+    //Backdrop
     rect(x+width/2,y+height/2,width,height,"black");
+
+    //Graph
     for (let index = 0; index < heartBeatHistory.length; index++) {
         const qrsValueAtPosition = heartBeatHistory[index];
         const qrsValueAtNextPosition = heartBeatHistory[index+1];
@@ -58,28 +68,34 @@ function heartBeatUI(x, y, width, height){
     }
 }
 
+//Determine next value to be added to the graph
 function pushNextBeatValue(){
-    var nextBeatValue = 0;
+    let nextBeatValue = 0;
 
+    //Timespan of one "square" on the EKG
     const squareSize = constants.ui.heartRate.square_size;
+    //Length of full complex
     const complexTime = constants.ui.heartRate.complex_width*squareSize;
+    //Length of PR segment of complex
     const prTime = constants.ui.heartRate.pr_width*squareSize;
+    //Length of QRS component of complex
     const qrsTime = constants.ui.heartRate.qrs_width*squareSize;
+    //Length of QT component of complex
     const qtTime = constants.ui.heartRate.qt_width*squareSize;
 
-
     if(beatTimeElapsed<=complexTime) {
+        //PR Segment
         if (beatTimeElapsed <= prTime) {
             nextBeatValue = 0.5*(Math.pow((beatTimeElapsed/squareSize - (prTime/2/squareSize)), 2)) - 2;
-        } else if (beatTimeElapsed > prTime + squareSize && beatTimeElapsed <= prTime + squareSize + (qrsTime / 4)) {
+        } else if (beatTimeElapsed > prTime + squareSize && beatTimeElapsed <= prTime + squareSize + (qrsTime / 4)) { //QRS Segment pt. 1
             nextBeatValue = -4 + beatTimeElapsed/squareSize;
-        } else if (beatTimeElapsed > prTime + squareSize + qrsTime / 4 && beatTimeElapsed <= prTime + squareSize + qrsTime / 2) {
+        } else if (beatTimeElapsed > prTime + squareSize + qrsTime / 4 && beatTimeElapsed <= prTime + squareSize + qrsTime / 2) { //QRS Segment pt. 2
             nextBeatValue = -14 * (beatTimeElapsed/squareSize - 4.5) - 0.5;
-        } else if (beatTimeElapsed > prTime + squareSize + qrsTime / 2 && beatTimeElapsed <= prTime + squareSize + (3*qrsTime / 4)) {
+        } else if (beatTimeElapsed > prTime + squareSize + qrsTime / 2 && beatTimeElapsed <= prTime + squareSize + (3*qrsTime / 4)) { //QRS Segment pt. 3
             nextBeatValue = 7 * (beatTimeElapsed/squareSize - 5) - 6.5;
-        } else if (beatTimeElapsed > prTime + squareSize + (3*qrsTime / 4) && beatTimeElapsed <= prTime + squareSize + qrsTime) {
+        } else if (beatTimeElapsed > prTime + squareSize + (3*qrsTime / 4) && beatTimeElapsed <= prTime + squareSize + qrsTime) { //QRS Segment pt. 4
             nextBeatValue = 2 * (beatTimeElapsed/squareSize - 6);
-        } else if (beatTimeElapsed > prTime + squareSize*2 + qrsTime && beatTimeElapsed <= prTime + squareSize*2 + qrsTime + qtTime) {
+        } else if (beatTimeElapsed > prTime + squareSize*2 + qrsTime && beatTimeElapsed <= prTime + squareSize*2 + qrsTime + qtTime) { //PT Segment
             nextBeatValue = 0.5 * Math.pow((beatTimeElapsed/squareSize - (prTime + squareSize*2 + qrsTime + qtTime/2)/squareSize),2) - 3;
         }
     }
diff --git a/docs/assets/js/player/lifeFunctions.js b/docs/assets/js/player/lifeFunctions.js
index c0edc9b..9fdf42f 100644
--- a/docs/assets/js/player/lifeFunctions.js
+++ b/docs/assets/js/player/lifeFunctions.js
@@ -1,9 +1,9 @@
 
-var breath = 180;
-var fullBreathTimer = 0;
-var heartRate = 60;
+let breath = 180;
+let fullBreathTimer = 0;
+let heartRate = 60;
 
-var timeSinceLastBeat = 0;
+let heartBeat = false;
 
 
 function updateLife() {
@@ -16,8 +16,6 @@ function updateLife() {
 
     if(keyPress[k.x]) {
         heartbeat();
-    } else {
-        timeSinceLastBeat++;
     }
 
 };
@@ -38,6 +36,6 @@ function breathe() {
 };
 
 function heartbeat() {
-    timeSinceLastBeat = 0;
+    heartBeat = true;
 
 };
\ No newline at end of file