diff --git a/html/index.html b/html/index.html
index 85e75ad..48e53b2 100644
--- a/html/index.html
+++ b/html/index.html
@@ -32,6 +32,29 @@
 		<title>DG9VH - MMDVM-Dashboard by DG9VH</title>
 	</head>
 	<body>
+		<!-- Config structure modal -->
+		<div id="configstructmodal" class="modal" tabindex="-1" role="dialog">
+			<div class="modal-dialog" role="document">
+				<div class="modal-content">
+					<div class="modal-header">
+						<h5 class="modal-title">Update your config.js please!</h5>
+						<button type="button" class="close" data-dismiss="modal" aria-label="Close">
+							<span aria-hidden="true">&times;</span>
+						</button>
+					</div>
+					<div class="modal-body">
+						<p>This text is shown to you, because you may use an old config.js-structure. Please open your config.js and compare it with the example-one in github-repository, add missing or change configuration options that has been renamed and add following line (or update existing one to this) into the config.js-file:</p>
+						<p>
+						var config_struc_ver = <script  type="text/javascript">document.write(act_config_struc_ver);</script>
+						
+						</p>
+					</div>
+					<div class="modal-footer">
+						<button type="button" class="btn btn-primary" data-dismiss="modal">Close</button>
+					</div>
+				</div>
+			</div>
+		</div>
 		<!-- Navigation -->
 		<nav class="navbar navbar-expand-lg navbar-dark bg-dark static-top">
 			<div class="container-fluid">
@@ -416,6 +439,8 @@
 				};
 				t_dapnet.order( [ 0, 'desc' ] ).draw();
 			}
+			
+			checkConfigStructure();
 		</script>
 	</body>
 </html>
diff --git a/html/js/config.js b/html/js/config.js
index 42eeb3f..92acc36 100644
--- a/html/js/config.js
+++ b/html/js/config.js
@@ -1,3 +1,6 @@
+// config structure version, please change to value in github-file after update and adding new values
+var config_struc_ver = 20210312.1;
+
 // 1 = show link to QRZ.com, 0 = off
 var qrz = 1;
 
diff --git a/html/js/functions.js b/html/js/functions.js
index f04595c..1230c15 100644
--- a/html/js/functions.js
+++ b/html/js/functions.js
@@ -1,3 +1,4 @@
+var act_config_struc_ver = 20210312.1;
 var messagecount = 0;
 var ts1TXing = null;
 var ts2TXing = null;
@@ -28,6 +29,13 @@ function logIt(message) {
 	}
 }
 
+function checkConfigStructure() {
+	if (typeof config_struc_ver === "undefined" || config_struc_ver < act_config_struc_ver) {
+		//alert("Old!");
+		$('#configstructmodal').modal('show');
+	}
+}
+
 function getTimezone() {
 	if (useClientTimezone) {
 		var d = new Date();
diff --git a/html/js/version.js b/html/js/version.js
index f539cf0..2eb204b 100644
--- a/html/js/version.js
+++ b/html/js/version.js
@@ -1 +1 @@
-var dashboard_version = "2021-02-22 22:05:12";
+var dashboard_version = "2021-03-12 14:49:51";
