diff --git a/CHANGELOG.md b/CHANGELOG.md
index adf4601bb3..52b1508f35 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,40 @@ For advice on how to use these release notes see [our guidance on staying up to
 
 ## Unreleased
 
+#### Update the HTML for the character count
+
+We've updated the HTML for the character count.
+
+The component wrapper `data-module="govuk-character-count"` and its form group `class="govuk-form-group"` are now combined as the same `<div>`. The hint text used as the count message is now placed directly after the `<textarea>`.
+
+If you're not using Nunjucks macros, then you should:
+
+- move the `govuk-form-group` and `govuk-form-group--error` (optional) classes from the form group to the component wrapper `<div>`
+- move any other custom classes and attributes from the form group to the component wrapper `<div>`
+- remove the opening `<div>` and closing `</div>` tags previously used by the form group
+
+For example, see how the HTML below:
+
+```html
+<div class="govuk-character-count" data-module="govuk-character-count" data-maxlength="100">
+  <div class="form-group form-group--error">
+    <!-- // -->
+  </div>
+</div>
+```
+
+would now be:
+
+```html
+<div class="form-group form-group--error govuk-character-count" data-module="govuk-character-count" data-maxlength="100">
+  <!-- // -->
+</div>
+```
+
+[Check your changes against the character count example in the Design System](https://design-system.service.gov.uk/components/character-count/#character-count-example) to make sure you have correctly implemented them.
+
+This change was introduced in [pull request #4566: Use Character count `formGroup` as module wrapper](https://github.com/alphagov/govuk-frontend/pull/4566).
+
 ### Fixes
 
 - [#4811: Use `KeyboardEvent.key` over deprecated `KeyboardEvent.keyCode` in the Tabs component](https://github.com/alphagov/govuk-frontend/pull/4811)