Update index.html

Author: matentzn

index.html

@@ -19,6 +19,8 @@
 
   <div class="jumbotron">
     <h1>Mapping Commons</h1>
+    
+    <h2>THIS MAPPING OVERVIEW IS UNDER DEVELOPMENT AND SHOULD NOT BE USED FOR ANYTHING.</h2>
 
     <div>
       Mapping Commons pulls together mappings from various sources with the goal of
@@ -44,4 +46,4 @@ <h1>Mapping Commons</h1>
 
 </body>
 
-</html>
+</html>