diff --git a/core/modules/link/src/Plugin/Field/FieldType/LinkItem.php b/core/modules/link/src/Plugin/Field/FieldType/LinkItem.php
index def735f..a552a0e 100644
--- a/core/modules/link/src/Plugin/Field/FieldType/LinkItem.php
+++ b/core/modules/link/src/Plugin/Field/FieldType/LinkItem.php
@@ -27,7 +27,7 @@
  *   description = @Translation("Stores a URL string, optional varchar link text, and optional blob of attributes to assemble a link."),
  *   default_widget = "link_default",
  *   default_formatter = "link",
- *   constraints = {"LinkType" = {}, "LinkAccess" = {}, "LinkExternalProtocols", "LinkNotExistingInternal"}
+ *   constraints = {"LinkType" = {}, "LinkAccess" = {}, "LinkExternalProtocols" = {}, "LinkNotExistingInternal" = {}}
  * )
  */
 class LinkItem extends FieldItemBase implements LinkItemInterface {