Add differences with requirejs i18n in the doc

Author: clmath

docs/i18n.md

@@ -9,10 +9,19 @@ title: requirejs-dplugins/i18n
  localized string.
 
 ##### Table of Contents
+[Differences with requirejs i18n](#differences-with-requirejs-i18n)  
 [Creating an i18n bundle](#creating-an-i18n-bundle)  
 [Using an i18n bundle](#using-an-i18n-bundle)  
 [Building i18n bundles](#building-i18n-bundles)  
 
+## Differences with requirejs i18n
+
+This plugin changes the way i18n bundles are built. While requirejs i18n adds bundles of a specified locale to the layer,
+`requirejs-dplugins/i18n` will create specific nls layers for each locale specified in the `localesList` option. The
+plugin will then load the appropriate nls layer depending on the user locale.
+
+
+
 ## Creating an i18n bundle
 
 Assume a `my` package, containing a `lamp` module. This module provides a string representing the color of the lamp.