Index: wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php
===================================================================
--- wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php	(revision 48360)
+++ wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php	(working copy)
@@ -91,7 +91,7 @@
 						'type'        => 'string',
 					),
 					'namespace' => array(
-						'description' => __( 'Block namespace' ),
+						'description' => __( 'Block namespace.' ),
 						'type'        => 'string',
 					),
 				),