diff --git a/static/scripts/refull.js b/static/scripts/refull.js
index f5c3f73..25ea5b4 100644
--- a/static/scripts/refull.js
+++ b/static/scripts/refull.js
@@ -4,14 +4,27 @@
  * @authors Timo Volkmann, Frank Herkommer.
  */
 
+// indexes of a list of all collected Serial data where Timestamps matched with the smallest time
+//difference so they can be fitted on a chart with a smaller amount of tcp data
 let indexes
 
-function composeTimestamp(servertime){
+/**
+ * function to parse a timestamp to a number
+ * @param time  Timestamp
+ * @returns composed    a number
+ */
+function composeTimestamp(time){
     let composed;
-    composed = servertime.slice(11,25).split(':').join("").split('.').join("");
+    composed = time.slice(11,25).split(':').join("").split('.').join("");
     return composed;
 }
 
+/**
+ * function to compare a Timestamp from tcp to all timestamps from serial to find a best match.
+ * @param num   tcp timestamp
+ * @param arr   list of serial timestamps
+ * @returns {(*|number)[]}  array with the index of the closest Serial timestamp match
+ */
 function findBestTimeMatch(num, arr) {
     let mid;
     let lo = 0;
@@ -30,6 +43,11 @@ function findBestTimeMatch(num, arr) {
     return [arr[hi], hi];
 }
 
+/**
+ * function that calls find best match function and saves the indexes from a match into a list.
+ * @param tcpdataList
+ * @param serialdataList
+ */
 function findSerialDataIndex(tcpdataList, serialdataList) {
     let allSerialTimes = []
 
@@ -108,7 +126,6 @@ window.addEventListener("load", function(evt) {
                 updateMapSERIALbulk(r.data.Data.SOURCE_SERIAL)
                 addSerialSpeedData(r.data.Data.SOURCE_SERIAL)
             }
-
             addDistances(prepareForDistanceCalc(r.data.Data))
         })
     }
diff --git a/static/scripts/websocket.js b/static/scripts/websocket.js
index e1ff012..82db335 100644
--- a/static/scripts/websocket.js
+++ b/static/scripts/websocket.js
@@ -1,3 +1,4 @@
+// Temporary TCP and Serial data used to calculate vincenty distance between two coordinates in realtime.
 let tempTCPCoords = null;
 let tempSERIALCoords = null;
 
@@ -27,8 +28,10 @@ window.addEventListener("load", function(evt) {
             ws.onerror = wsOnErrorF
         }, 1000)
     }
+    // function called every time a message is received by the server.
     const wsOnMessageF = function (evt) {
         let dat = JSON.parse(evt.data)
+        // If message comes from TCP source call functions to add TCP data != 0 to the charts
         if ('SOURCE_TCP' in dat) {
             setIndicatorsTcp(dat.SOURCE_TCP)
             if(dat.SOURCE_TCP.Orientation[0] !== 0 && dat.SOURCE_TCP.Orientation[1] !== 0 && dat.SOURCE_TCP.Orientation[2] !== 0){
@@ -58,6 +61,7 @@ window.addEventListener("load", function(evt) {
             }
         }
 
+        // If message comes from Serial source call functions to add serial data != 0 to the charts
         if ('SOURCE_SERIAL' in dat) {
             setIndicatorsSer(dat.SOURCE_SERIAL)
             if(dat.SOURCE_SERIAL.Orientation[0] !== 0 && dat.SOURCE_SERIAL.Orientation[2] !== 0){
@@ -137,6 +141,8 @@ window.addEventListener("load", function(evt) {
         oldNode = output.firstChild
         output.replaceChild(d, oldNode)
     };
+
+    // On open send HTTP request corresponding to the chosen Source/s
     document.getElementById("open").onclick = function(evt) {
         if(checkBoxSmartphone.checked && checkBoxUblox.checked){
             fetch('http://localhost:3011/trackings?serial=true&tcp=true', { method: 'POST', body: 'some test data'})
@@ -176,6 +182,10 @@ window.addEventListener("load", function(evt) {
 
     //------------------------Buttons------------------------------
 
+    /*
+    Provides every Button with the corresponding HTTP request if the websocket is open.
+     */
+
     document.getElementById("messungstarten").onclick = function(evt) {
         if (ws) {
             fetch('http://localhost:3011/trackings/', { method: 'PATCH', body: 'some data'})