diff --git a/resources/www/admin/styles/main.scss b/resources/www/admin/styles/main.scss
index 254a8c409c..9317fd9997 100644
--- a/resources/www/admin/styles/main.scss
+++ b/resources/www/admin/styles/main.scss
@@ -322,7 +322,9 @@ div.switch_right.unchecked {
 #admin_setup_registry .form-horizontal .controls, #admin_setup_registry .form-horizontal .help-message {
   margin-left: 300px;
 }
-
+.alert .close{
+  text-decoration: none;
+}
 
 @import './databases';
 @import './fields';
diff --git a/templates/web/admin/fields/index.html.twig b/templates/web/admin/fields/index.html.twig
index f9c71746ad..e8198a324f 100644
--- a/templates/web/admin/fields/index.html.twig
+++ b/templates/web/admin/fields/index.html.twig
@@ -1,5 +1,10 @@
 <div id="admin-field-app" class="container-fluid">
     {# sbas_id is saved in the dom and used to fetch right models and collections #}
+    <div class="alert alert-danger">
+        <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
+        <strong>{% trans %}Danger zone !{% endtrans %}</strong><br>
+        <span>{% trans %}See documentation about structure manipulation.{% endtrans %}</span>
+    </div>
     <input type="hidden" name="current_sbas_id" value="{{ sbas_id }}">
     <div class="row-fluid row-top">
         <div class="span4 save-block">