diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index dcb9bb9b70..e2b1f2307c 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -12,6 +12,7 @@ Changelog
  * `ChoiceBlock` now omits the blank option if the block is required and has a default value (Andreas Nüßlein)
  * The `add_subpage` view now maintains a `next` URL parameter to specify where to redirect to after completing page creation (Robert Rollins)
  * The `wagtailforms` module now allows to define custom form submission model, add custom data to CSV export and some other customisations (Mikalai Radchuk)
+ * The Webpack configuration is now in a subfolder, and uses env-specific configurations (Janneke Janssen, Thibaud Colas)
  * Fix: Help text for StreamField is now visible and does not cover block controls (Stein Strindhaug)
  * Fix: "X minutes ago" timestamps are now marked for translation (Janneke Janssen, Matt Westcott)
  * Fix: Avoid indexing unsaved field content on `save(update_fields=[...])` operations (Matt Westcott)
diff --git a/docs/releases/1.9.rst b/docs/releases/1.9.rst
index 1c8e545794..71db4c32b1 100644
--- a/docs/releases/1.9.rst
+++ b/docs/releases/1.9.rst
@@ -36,7 +36,7 @@ Other features
  * ``ChoiceBlock`` now omits the blank option if the block is required and has a default value (Andreas Nüßlein)
  * The ``add_subpage`` view now maintains a ``next`` URL parameter to specify where to redirect to after completing page creation (Robert Rollins)
  * The ``wagtailforms`` module now allows to define custom form submission model, add custom data to CSV export and some other customisations. See :doc:`/reference/contrib/forms/customisation` (Mikalai Radchuk)
-
+ * The Webpack configuration is now in a subfolder to declutter the project root, and uses environment-specific configurations for smaller bundles in production and easier debugging in development (Janneke Janssen, Thibaud Colas)
 
 Bug fixes
 ~~~~~~~~~