# core_block (subsystem / plugintype) Upgrade notes

## 5.1

### Changed

- Subcontext visibility is now turned on by default when adding blocks. This change makes it much easier to manage blocks, for example, in courses that lack a view page.

  For more information see [MDL-85433](https://tracker.moodle.org/browse/MDL-85433)

### Removed

- Removed block_section_links from Moodle 5.1.

  For more information see [MDL-80556](https://tracker.moodle.org/browse/MDL-80556)

## 5.0

### Removed

- Removed block_mnet_hosts plugin from core

  For more information see [MDL-84309](https://tracker.moodle.org/browse/MDL-84309)
