Add CHANGELOG entry

CHANGELOG.md

@@ -38,6 +38,17 @@ This text is announced by screen readers when the character count input is focus
 
 This was added in [pull request #2742: Add ability to customise character count fallback text](https://github.com/alphagov/govuk-frontend/pull/2742).
 
+####  Localise the character count's input description for assistive technologies
+
+When configuring the character count's limit in JavaScript, you can customise the description provided to assistive technologies when users focus the input (so it indicates the overall limit of characters or words).
+
+You can pass the description in the HTML, using `data-i18n.fallback-hint.{other,many,few,two,one,zero}` attribute on the element, depending on the [plural form required by your locale](https://design-system.service.gov.uk/get-started/localisation/#pluralisation), to provide the text to set as the description.
+
+You can also provide these messages using a JavaScript configuration object when creating an instance of the component or initialising all components.
+See [our guidance on localising GOV.UK Frontend](https://design-system.service.gov.uk/get-started/localisation/) for how to do this.
+
+This was added in [pull request #2915](https://github.com/alphagov/govuk-frontend/pull/2915).
+
 #### Localise the accordion's toggle buttons
 
 You can now translate the text of the [accordion](https://design-system.service.gov.uk/components/character-count/) component's show and hide toggle buttons.