Update README.md

README.md

@@ -111,10 +111,11 @@ Thus, you can define OS or platform specific rules and they will have more prior
 More of API and possibilities you will find in the `docs` folder.
 
 # Advanced Usage
-By default, `require('bowser')` requires the pre-compiled file, which can
-include useless for you polyfills. In case you don't need that, you can choose
-using source file requiring bowser like that: `require('bowser/src/bowser`);
-Then you get ES2015 file, which is not precompiled and can be easier to debug.
+By default, `require('bowser')` requires the *ES6 version of files*, which
+**don't** include any polyfills. In case if you don't use your own `babel-polyfill`
+you may need to have pre-built bundle with all needed polyfills.
+It's possible requiring bowser like that: `require('bowser/compiled');`
+As result you get a ES5 file with `babel-polyfill` bundled in it.
 
 # Contributing
 If you'd like to contribute a change to bowser, modify the files in `src/`, then run the following (you'll need node + npm installed):