diff --git a/README.md b/README.md
index d4d58dc..0ef2521 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,6 @@ the container please mount a volume in ``/var/www/html/data/``
 # Config
 You can configure the visualization frontend via ``appConfig.js``
 copy the ``/js/appConfig.example.js`` into ``/data/appConfig.js`` (where your volume should be mounted).
-Change ``let appConfig = {`` to ``appConfig = {`` in /data/appConfig.js
 
 #### Libs used
 1. Bootstrap 4 - alpha
diff --git a/index.html b/index.html
index eb2b815..ff1dcec 100755
--- a/index.html
+++ b/index.html
@@ -18,8 +18,8 @@
 
 
     <!-- custom -->
-    <script type="text/javascript" src="data/appConfig.js"></script>
     <script type="text/javascript" src="js/appConfig.example.js"></script>
+    <script type="text/javascript" src="data/appConfig.js"></script>
     <script type="text/javascript" src="js/evaluation.js"></script>
 
     <link rel="shortcut icon" type="image/x-icon" href="favicon.ico"/>
diff --git a/js/appConfig.example.js b/js/appConfig.example.js
index ae9ef42..5539a73 100644
--- a/js/appConfig.example.js
+++ b/js/appConfig.example.js
@@ -1,30 +1,37 @@
 /**
  * To customize your settings:
  * 1. copy appConfig.example.js into /data/appConfig.js
- * 2. change "let appConfig = {" to "appConfig = {" in /data/appConfig.js
+ * 2. change values in /data/appConfig.js
  * 3. restart the container if it is already running
  */
-let appConfig = {
-  "customTitle": "Statistics",
-  "dateFormat": "DD.MM.YYYY",
-  "locale": "de",
-  "labels": {
-    "download": "Download",
-    "ping": "Ping",
-    "upload": "Upload"
-  },
-  "daterange": {
-    "timePicker": true,
-    "timePicker24Hour": true,
-    "startDate": moment().startOf('day'),
-    "endDate": moment().endOf('day'),
-    ranges: {
-      'Today': [moment().hours(0).minutes(0).seconds(0), moment().hours(23).minutes(59).seconds(59)],
-      'Yesterday': [moment().hours(0).minutes(0).seconds(0).subtract(1, 'days'), moment().hours(23).minutes(59).seconds(59).subtract(1, 'days')],
-      'Last 7 Days': [moment().subtract(6, 'days'), moment()],
-      'Last 30 Days': [moment().subtract(29, 'days'), moment()],
-      'This Month': [moment().startOf('month'), moment().endOf('month')],
-      'Last Month': [moment().subtract(1, 'month').startOf('month'), moment().subtract(1, 'month').endOf('month')]
+if (typeof appConfig == 'undefined') {
+  var appConfig = {};
+}
+
+appConfig = {
+  ...appConfig,
+  ...{
+    "customTitle": "Statistics",
+    "dateFormat": "DD.MM.YYYY",
+    "locale": "de",
+    "labels": {
+      "download": "Download",
+      "ping": "Ping",
+      "upload": "Upload"
+    },
+    "daterange": {
+      "timePicker": true,
+      "timePicker24Hour": true,
+      "startDate": moment().startOf('day'),
+      "endDate": moment().endOf('day'),
+      ranges: {
+        'Today': [moment().hours(0).minutes(0).seconds(0), moment().hours(23).minutes(59).seconds(59)],
+        'Yesterday': [moment().hours(0).minutes(0).seconds(0).subtract(1, 'days'), moment().hours(23).minutes(59).seconds(59).subtract(1, 'days')],
+        'Last 7 Days': [moment().subtract(6, 'days'), moment()],
+        'Last 30 Days': [moment().subtract(29, 'days'), moment()],
+        'This Month': [moment().startOf('month'), moment().endOf('month')],
+        'Last Month': [moment().subtract(1, 'month').startOf('month'), moment().subtract(1, 'month').endOf('month')]
+      }
     }
   }
 };