Inline documentation explaining some functionality.

assets/js/admin/settings-views-html-settings-tax.js

@@ -116,6 +116,9 @@
 		return false;
 	});
 
+	/**
+	 * Postcode and city don't have `name` values by default. They're only created if the contents changes, to save on database queries (I think)
+	 */
 	$('.wc_tax_rates td.postcode, .wc_tax_rates td.city').find('input').change(function() {
 		$(this).attr( 'name', $(this).attr( 'data-name' ) );
 	});