diff --git a/test/nightwatch/environment.js b/test/nightwatch/environment.js
index 0ed3a1c..4503a3f 100644
--- a/test/nightwatch/environment.js
+++ b/test/nightwatch/environment.js
@@ -2,6 +2,6 @@ var assert = require('assert');
 
 module.exports = {
   'Fetch Web API' : function(browser) {
-    assert(typeof fetch == "function");
+    assert(typeof fetch == "function", "fetch function is not available");
   }
 };