diff --git a/README.md b/README.md
index 38ad7b9..fd21728 100644
--- a/README.md
+++ b/README.md
@@ -1,125 +1,152 @@
 # boz-mw
 
 This is another MediaWiki API handler in PHP.
 
 ## Download
 
 	git clone https://github.com/valerio-bozzolan/boz-mw
 
 ## Command line tools
 
 See [the tools](./tools/README.md).
 
 ## API framework showcase
 
 Here some usage examples.
 
 ### Basic API query
 
 ```php
 <?php
 require 'boz-mw/autoload.php';
 
 // load it.wiki
 $wiki = \wm\WikipediaIt::instance();
 
 $response =
 	$wiki->fetch( [
 		'action' => 'query',
 		'prop'   => 'info',
 		'titles' => [
 			'Pagina principale'
 		]
 	] );
 
 print_r( $response );
 ```
 
 ### API query with continuation
 
 
 ```php
 $wiki = \wm\WikipediaIt::instance();
 
 $queries =
 	$wiki->createQuery( [
 		'action'  => 'query',
 		'list'    => 'categorymembers',
 		'cmtitle' => 'Categoria:Software con licenza GNU GPL',
 	] );
 
 foreach( $queries as $query ) {
 	print_r( $query );
 }
 ```
 
-### Edit API query
+### Login and Edit API query
 
 ```php
 $wiki = \wm\WikipediaIt::instance();
 
 $user     = '';
 $password = '';
 $wiki->login( $user, $password );
 
 $wiki->edit( [
 	'title'   => 'Special:Nothing',
 	'text'    => 'My wikitext',
 	'summary' => 'My edit summary',
 ] );
 ```
 
+Note that you can also call `login()` without parameters if you specify a global username and password on the top of your script:
+
+```php
+\mw\API::$DEFAULT_USERNAME = '':
+\mw\API::$DEFAULT_PASSWORD = '';
+```
+
 ### Wikidata SPARQL query
 
 What if you want to list all the [cats from Wikidata](https://query.wikidata.org/#%23Cats%0ASELECT%20%3Fitem%20%3FitemLabel%20%0AWHERE%20%0A%7B%0A%20%20%3Fitem%20wdt%3AP31%20wd%3AQ146.%0A%20%20SERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%20%22%5BAUTO_LANGUAGE%5D%2Cen%22.%20%7D%0A%7D)?
 
 ```php
 // you should know how to build a SPARQL query
 $query  = 'SELECT ?item ?itemLabel WHERE {';
 $query .= ' ?item wdt:P31 wd:Q146 ';
 $query .= ' SERVICE wikibase:label { bd:serviceParam wikibase:language "en". } ';
 $query .= '}';
 
 // query Wikidata and decode the response
 $rows = \wm\Wikidata::querySPARQL( $query );
 
 // for each cat
 foreach( $rows as $row ) {
 
 	// example: 'http://www.wikidata.org/entity/Q5317221'
 	$url = $row->item->value;
 
 	// example: 'Q5317221'
 	$id = basename( $url );
 
 	// example: 'Dusty the Klepto Kitty'
 	$itemLabel = $row->itemLabel->value;
 
 	echo "Found cat ID: $id. Name: $itemLabel \n";
 }
 ```
 
+### Wikidata edit API
+
+```php
+$data = new \wb\DataModel();
+
+// add a Commons category
+$statement = new \wb\StatementCommonsCategory( 'P373', 'Test category name' );
+$data->addClaim( $statement );
+
+// set a new label value
+$label = \wb\Label( 'en', "New label" );
+$data->setLabel( $label );
+
+// save
+\wm\Wikidata::instance()->editEntity(
+	'id'   => 'Q4115189',
+	'data' => $data->getJSON(),
+] );
+```
+
 ### Upload API query
 
 Uploading a file requires to respect the [RFC1341](https://tools.ietf.org/html/rfc1341) about an HTTP multipart request.
 
 Well, we made it easy:
 
 ```php
 $photo_url = 'http://.../libre-image.jpg';
 $wiki->upload( [
 	'comment'  => 'upload file about...',
 	'text'     => 'bla bla [[bla]]',
 	'filename' => 'Libre image.jpg',
 	\network\ContentDisposition::createFromNameURLType( 'file', $photo_url, 'image/jpg' ),
 ] );
 ```
 
 See the [`ContentDisposition`](include/class-network\ContentDisposition.php) class for some other constructors.
 
 Well, I have not the time to document also the Wikibase part, but hey, we support it quite well.
 
 ## Known usage
 * [MediaWikiOrphanizerBot](https://github.com/valerio-bozzolan/MediaWikiOrphanizerBot)
 * [ItalianWikipediaDeletionBot](https://github.com/valerio-bozzolan/ItalianWikipediaDeletionBot)
 * [wiki-users-leaflet](https://github.com/valerio-bozzolan/wiki-users-leaflet/) hosted at [WMF Labs](https://tools.wmflabs.org/it-wiki-users-leaflet/)