diff --git a/wolf.js b/wolf.js
index f3e4655..f7a379a 100644
--- a/wolf.js
+++ b/wolf.js
@@ -667,6 +667,8 @@
                         if (!ptmpl.controller || ptmpl.fragmentedController) {
                             ptmpl.controller = template.controller;
                             ptmpl.fragmentedController = true;
+                        } else {
+                            console.warn("wolf: Can't install fragment controller on parent element because already have one");
                         }
                         if (template.controller && template.controller.init) {
                             template.controller.init(parentElement);