diff --git a/examples/concept.html b/examples/concept.html
index b25b578..8b5962c 100644
--- a/examples/concept.html
+++ b/examples/concept.html
@@ -18,8 +18,14 @@
     </select>
     <input id="add-point" type="button" value="Add a point"></input>
     <script src="../ol3/build/ol.js"></script>
+
+    <!-- local -->
     <script type="text/javascript"
             src="https://maps.googleapis.com/maps/api/js?v=3.21&key=AIzaSyD71KlyTCXJouZsGbgPCJ-oCtK76fZJUTQ"></script>
+    <!-- dev5 -->
+    <!--script type="text/javascript"
+            src="https://maps.googleapis.com/maps/api/js?v=3.21&key=AIzaSyCXIGZ41A54812NVcfTIuFS2mQUK-9JYeg"></script-->
+
     <script src="/@loader"></script>
     <!--script src="../dist/ol3gm.js"></script-->
     <script src="concept.js"></script>