diff --git a/core/CHANGELOG.txt b/core/CHANGELOG.txt
index 10e824f9e3..03ca2a1690 100644
--- a/core/CHANGELOG.txt
+++ b/core/CHANGELOG.txt
@@ -1,3 +1,71 @@
+Drupal 8.4.0, 2017-10-05
+------------------------
+## Note for Drush users: Update to Drush 8.1.12
+
+Versions of [Drush]() earlier than 8.1.12 will not work with Drupal 8.4.x.
+Update Drush to 8.1.12 before using it to update Drupal core or you will
+encounter fatal errors.
+
+## New stable modules
+
+The following modules, previously considered experimental, are now stable and
+safe for use on production sites, with full backwards compatibility and upgrade
+paths from 8.4.0 to future releases:
+
+### Datetime Range
+
+The [Datetime Range module](https://www.drupal.org/node/2893128) provides a
+field type that allows end dates to support contributed modules like
+[Calendar](https://www.drupal.org/project/calendar).
+
+### Media
+
+The [Media module]() provides an API for reusable media entities and references
+based on the contributed [Media entity module](). The API and data model are
+stable, so developers and expert site builders can add Media as a dependency.
+However, the module has numerous user experience issues, so it is *hidden*
+and will not appear on the 'Extend' (module administration) page. (Enabling a
+contributed module that depends on the Media module will also enable the
+Media automatically.) The module will be displayed to site builders normally
+once the user experience issues are resolved in a future release.
+
+## REST and API-first improvements
+
+## Developer experience improvements
+
+## Automated testing improvements
+
+## Third-party library updates
+
+* [Drupal's Symfony dependency has been updated from Symfony 2.8 to Symfony
+  3.2](https://www.drupal.org/node/2712647). This major version update is
+  necessary because Symfony 2.8 support will end around the release of Drupal
+  8.6.0 next year. [See the change record for information about Symfony 3 BC
+  breaks that affected Drupal core](https://www.drupal.org/node/2743809).
+  [Drupal 8 also requires Symfony 3.2.8](https://www.drupal.org/node/2871253)
+  because of a bug in Symfony 3.2.7.
+* [zendframework/zend-diactoros has been updated from 1.3.10 to 1.4.0](https://www.drupal.org/node/2874817).
+* [jQuery UI has been updated from 1.11.4 to 1.12.1](https://www.drupal.org/node/2809427).
+
+## Experimental modules
+
+(Move sections up to "new stable modules" if they become stable.)
+
+### Migrate
+
+### Migrate Drupal
+
+### Migrate Drupal UI
+
+### Workflows and Content Moderation
+
+### Layout Discovery and Field Layout
+
+### Settings Tray
+
+### Place Block
+
+
 Drupal 8.3.0, 2017-04-05
 ------------------------
 - Added modules: