diff --git a/core/CHANGELOG.txt b/core/CHANGELOG.txt
index 10e824f..2075f36 100644
--- a/core/CHANGELOG.txt
+++ b/core/CHANGELOG.txt
@@ -1,3 +1,88 @@
+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). This stable release is
+backwards-compatible with the 8.3.x experimental version and shares a
+consistent API with other Datetime fields.
+
+Future releases may improve Views support, usability, Datetime Range field
+validation, and add REST improvements. For bugs or feature requests for this
+module, [see the core Datetime issue queue](https://www.drupal.org/project/issues/search/drupal?project_issue_followers=&status%5B%5D=Open&version%5B%5D=8.x&component%5B%5D=datetime.module&issue_tags_op=%3D).
+
+### Media
+
+The new core [Media module](https://www.drupal.org/node/2895059) provides an
+API for reusable media entities and references. It is based on the contributed
+[Media Entity module](https://www.drupal.org/project/media_entity).
+
+Since there is a rich ecosystem of Drupal contributed modules built on Media
+Entity, the top priority for this release is to provide a stable core API and
+data model for a smoother transition for these modules. Developers and expert
+site builders can add Media as a dependency. Work is underway to [provide an
+update path for existing sites' Media Entity data](https://www.drupal.org/node/2880334) and to [port existing contributed modules to the refined core API](https://www.drupal.org/node/2860796).
+
+Note that **the core Media module is currently marked hidden** and will not
+appear on the 'Extend' (module administration) page. (Enabling a contributed
+module that depends on the core Media module will also enable the Media
+automatically.) The module will be displayed to site builders normally once
+user experience issues with it are resolved in a future release.
+
+## Content authoring and site administration improvements
+
+## REST and API-first improvements
+
+## Performance and scalability 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: