diff --git a/pages/ex-two.html b/pages/ex-two.html
index affe4b5..a8ddbd6 100644
--- a/pages/ex-two.html
+++ b/pages/ex-two.html
@@ -99,6 +99,8 @@
 
         if (startPoint && endPoint) {
           polyline = L.polyline([startPoint, endPoint], { color: "red" }).addTo(map);
+          startPoint = null;
+          endPoint = null;
         }
       });
     </script>