diff --git a/templates/app/map.html.twig b/templates/app/map.html.twig
index 32e618b..8c37169 100644
--- a/templates/app/map.html.twig
+++ b/templates/app/map.html.twig
@@ -12,6 +12,14 @@
 
 {% block content %}
 
+<div class="alert alert-danger my-5">
+    <button type="button" class="close" data-dismiss="alert" aria-label="Close">
+        <span aria-hidden="true">&times;</span>
+    </button>
+    <strong>Warning!</strong><br>
+    The URL <a href="#" class="alert-link font-weight-normal">https://mapfile.herokuapp.com/</a> will soon be removed. The new URL is <a href="https://mapfile.akoo.be/" class="alert-link">https://mapfile.akoo.be/</a>.
+</div>
+
 <h1>Map</h1>
 <hr>