update readme with documentation for file_item_count

README

@@ -6,17 +6,18 @@ Make sure to set $wordpress_root_dir and $_SERVER['HTTP_HOST'] according to your
 
 Then execute the script with the following parameters ( brackets indicate optional parameters ):
 
-php cli-exporter.php --blog=blogname --path=/tmp/ --user=admin [--start_date=2011-01-01] [--end_date=2011-12-31] [--post_type=post] [--author=admin] [--category=Uncategorized] [--post_status=publish] [--skip_comments=1]
+php cli-exporter.php --blog=blogname --path=/tmp/ --user=admin [--start_date=2011-01-01] [--end_date=2011-12-31] [--post_type=post] [--author=admin] [-- * category=Uncategorized] [--post_status=publish] [--skip_comments=1] [--file_item_count=1000]
 
 blogname: the name or blog_id of the blog you like to export
 path: the full path to the directory where exports should be stored
-user: the WordPress username that will run this export
+user: the WordPress username or ID that will run this export
 start_date: only export posts older than this date (format: YYYY-MM-DD)
 end_date: only export posts newer than this date (format: YYYY-MM-DD)
 post_type: export only posts matching this post_type
 author: export only posts for this user_login or user_id
 category: export only posts with this category name
 post_status: export only posts with a particular post status
 skip_comments: if this is set to 1 then comments will not be exported
+file_item_count: how many items to include per file (will automatically break up into several files at the specified interval)
 
 I hope this is useful. Feedback welcome at http://wp.me/p1lkCl-43Q