Update browser testing instructions

diff --git a/README.md b/README.md
index 175612bad8f692736905cf0b1ec944b189009045..cbd6bd29c91e35d6410c2bb2c3caa39f0291ecbf 100644 (file)
--- a/README.md
+++ b/README.md
@@ -328,7 +328,8 @@ Then, to run tests in Node.js, run:
 
 To test locally in a browser, you can run:
 
-    npm run test-browser-local
+    npm run test-browser-es5-local # For ES5 browsers that don't support ES6
+    npm run test-browser-es6-local # For ES6 compliant browsers
 
 This will print out a URL that you can then open in a browser to run the tests, using [Zuul](https://github.com/defunctzombie/zuul).