Update README.md

README.md

@@ -4,7 +4,7 @@ silverstripe-quickaddnew
 What is it?
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-A decorator for form fields that manage object relationships, to allow adding a new object on the fly through a dialog window. It can handle has_one, has_many or many_many relationships. At the moment it has been tested / works on DropdownField, ListboxField. It works both in the CMS and in the frontend. For frontend, [Select2Field or MultiSelect2Field](https://github.com/sheadawson/silverstripe-select2) are recommended.
+A decorator for form fields that manage object relationships, to allow adding a new object on the fly through a dialog window. It can handle has_one, has_many or many_many relationships. At the moment it has been tested / works on DropdownField, ListboxField and CheckboxSetField. It works both in the CMS and in the frontend. For frontend, [Select2Field or MultiSelect2Field](https://github.com/sheadawson/silverstripe-select2) are recommended.
 
 Screenshot
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@@ -37,4 +37,4 @@ Next, we can tell the field to use and configure quickaddnew. The first paramete
 
 Add the field to your FieldList
 
-	$fields->addFieldToTab('Root.Main', $field);
+	$fields->addFieldToTab('Root.Main', $field);