Index: wp-includes/class-wp-xmlrpc-server.php
===================================================================
--- wp-includes/class-wp-xmlrpc-server.php	(revision 39258)
+++ wp-includes/class-wp-xmlrpc-server.php	(working copy)
@@ -546,7 +546,7 @@
 				'option'        => 'large_size_h'
 			),
 			'default_comment_status' => array(
-				'desc'          => __( 'Allow people to post comments on new articles' ),
+				'desc'          => __( 'Allow people to post comments on new articles.' ),
 				'readonly'      => false,
 				'option'        => 'default_comment_status'
 			),