Add note about reinitializing plugins after navigation

Fixes #560

README.md

@@ -295,6 +295,24 @@ $(document).on('pjax:timeout', function(event) {
 
 ## Advanced configuration
 
+### Reinitializing plugins/widget on new page content
+
+The whole point of pjax is that it fetches and inserts new content _without_
+refreshing the page. However, other jQuery plugins or libraries that are set to
+react on page loaded event (such as `DOMContentLoaded`) will not pick up on
+these changes. Therefore, it's usually a good idea to configure these plugins to
+reinitialize in the scope of the updated page content. This can be done like so:
+
+``` js
+$(document).on('ready pjax:end', function(event) {
+  $(event.target).initializeMyPlugin()
+})
+```
+
+This will make `$.fn.initializeMyPlugin()` be called at the document level on
+normal page load, and on the container level after any pjax navigation (either
+after clicking on a link or going Back in the browser).
+
 ### Response types that force a reload
 
 By default, pjax will force a full reload of the page if it receives one of the