+--------------------------------------------+
| Catalog Diff Report                        |
+--------------------------------------------+
Table `grtdiff_alter_test`.`t1` was modified
  foreign keys:
  - removed foreign key: c1
  __
Table `grtdiff_alter_test`.`t1` was modified
  foreign keys:
  - added foreign key c1 with columns: id, referred table: ref_t2 with columns: id
    - action on update: none
    - action on delete: none
  __
----------------------------------------------
End of MySQL Workbench Report