diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 7fb97a0aa2..92e81c79f7 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -65,6 +65,7 @@ Changelog
  * Docs: Correct `WAGTAIL_WORKFLOW_REQUIRE_REAPPROVAL_ON_EDIT` documentation to state that it defaults to `False` (Matt Westcott)
  * Docs: Add an example of customizing a default accessibility check (Cynthia Kiser)
  * Docs: Demonstrate access protection with `TokenAuthentication` in the Wagtail API v2 Configuration Guide (Krzysztof Jeziorny)
+ * Docs: Replace X links with Mastodon in the README (Alex Morega)
  * Maintenance: Removed support for Python 3.8 (Matt Westcott)
  * Maintenance: Drop pytz dependency in favour of `zoneinfo.available_timezones` (Sage Abdullah)
  * Maintenance: Relax django-taggit dependency to allow 6.0 (Matt Westcott)
diff --git a/docs/releases/6.3.md b/docs/releases/6.3.md
index f892bcc7b3..a3b7d63916 100644
--- a/docs/releases/6.3.md
+++ b/docs/releases/6.3.md
@@ -124,6 +124,7 @@ This feature was developed by Bart Cieliński, alexkiro, and Sage Abdullah.
  * Correct [`WAGTAIL_WORKFLOW_REQUIRE_REAPPROVAL_ON_EDIT`](workflow_settings) documentation to state that it defaults to `False` (Matt Westcott)
  * Add an example of customizing a default accessibility check in the [Authoring accessible content](authoring_accessible_content) section (Cynthia Kiser)
  * Demonstrate access protection with `TokenAuthentication` in the [Wagtail API v2 Configuration Guide](/advanced_topics/api/v2/configuration) (Krzysztof Jeziorny)
+ * Replace X links with Mastodon in the README (Alex Morega)
 
 ### Maintenance