diff --git a/app/views/application/_flash_messages.html.erb b/app/views/application/_flash_messages.html.erb
index 364e3e5ca..f31f37024 100644
--- a/app/views/application/_flash_messages.html.erb
+++ b/app/views/application/_flash_messages.html.erb
@@ -1,5 +1,6 @@
 <% display = (flash[:notice] || flash[:alert] || flash[:warning]) ? 'block' : 'none' %>
 <div id="flash" style="display: <%= display %>;">
+    <!-- Used by Mobile-ID login -->
     <% type = (flash[:notice]) ? 'bg-success' : 'bg-danger' %>
     <% type = 'bg-warning' if flash[:warning] %>
     <div class="<%= type %> alert">