diff --git a/test/sample-signals.html b/test/sample-signals.html
index 95cd1eaf8..7d9837270 100644
--- a/test/sample-signals.html
+++ b/test/sample-signals.html
@@ -18,10 +18,21 @@
   //  Configure MathJax
   //
   MathJax.Hub.Config({
-    extensions: ["tex2jax.js"],
+    extensions: ["tex2jax.js","TeX/noUndefined.js"],
     jax: ["input/TeX","output/HTML-CSS"],
-    tex2jax: {inlineMath: [["$","$"],["\\(","\\)"]]}
+    tex2jax: {inlineMath: [["$","$"],["\\(","\\)"]]},
+    TeX: {extensions: ["AMSmath.js","AMSsymbols.js"]}
   });
+  //
+  //  Display messages when these files are loaded
+  //  (Note the difference between extensions and TeX.extensions,
+  //   and the difference between when noUndefind is loaded compared
+  //   to when it signals that it is ready)
+  //
+  MathJax.Hub.Register.LoadHook("[MathJax]/extensions/TeX/noUndefined.js",
+    function () {MathJax.Hub.Startup.signal.Post("*** noUndefined Loaded ***")});
+  MathJax.Hub.Register.LoadHook("[MathJax]/extensions/TeX/AMSmath.js",
+    function () {MathJax.Hub.Startup.signal.Post("*** AMSmath Loaded ***")});
 
   //
   //  Display a message that we are in the configuration code