diff --git a/RELEASE-NOTES-1.36 b/RELEASE-NOTES-1.36
index 67d9fc62e02..6d408ce3ef7 100644
--- a/RELEASE-NOTES-1.36
+++ b/RELEASE-NOTES-1.36
@@ -297,6 +297,13 @@ because of Phabricator reports.
   and ::checkExistingRevision() were marked as @internal to allow for
   breaking changes. They are no longer safe to call. The methods were
   unused outside of MediaWiki core.
+* Special pages provided by core now using service injection via constructor.
+  When extending a special page the call to grandparent constructor
+  ("SpecialPage::__construct()") in the sub class breaks the extension special
+  page, because the fallback code in the parent constructor cannot set the
+  services as needed. Be sure to call the parent constructor when extending
+  core special pages. The extending of core special pages is not part of the
+  stable interface and should be avoided.
 * Language::getExtraUserToggles and ::viewPrevNext, deprecated in 1.34, have
   been removed.
 * StreamFile::send404Message and ::parseRange, deprecated in 1.34, have been