Add documentation for pjax options

README.md

@@ -228,6 +228,29 @@ $(document).on('pjax:timeout', function(event) {
 })
 ```
 
+### Options
+
+The following options might be useful to customize behavior:
+
+* `timeout` - A timeout on ajax requests
+* `type` - The HTTP method to use (defaults to GET)
+* `dataType` - Defaults to html
+* `scrollTo` - A position to scroll the page to after pjax. Defaults to 0
+* `maxCacheLength` - The number of history states to cache
+* `fragment` - Set to load only a part of the target URL's content
+
+By default, the `scrollTo` parameter causes each click to scroll to the top of the page.  This simulates normal browsing behavior.  To disable this behavior, set the `scrollTo` parameter to false.
+
+``` javascript
+$(document).pjax('a', '#pjax-container', {scrollTo: false});
+```
+
+or set a default for requests
+
+``` javascript
+$.pjax.defaults.scrollTo = false;
+```
+
 ### Server side
 
 Server configuration will vary between languages and frameworks. The following example shows how you might configure Rails.
@@ -244,6 +267,12 @@ An `X-PJAX` request header is set to differentiate a pjax request from normal XH
 
 Check if your favorite server framework supports pjax here: https://gist.github.com/4283721
 
+If you are not using a server framework that can detect the `X-PJAX` header (or if you are using static HTML files), use the `fragment` option to restrict what gets loaded.
+
+``` javascript
+$(document).pjax('a', '#pjax-container', {fragment: '#pjax-container'});
+```
+
 #### Layout Reloading
 
 Layouts can be forced to do a hard reload assets or html changes.