[TASK] Mention core-upgrader (#391)

* [TASK] Mention core-upgrader Releases: main, 12.4, 11.5 --------- Co-authored-by: Garvin Hicking <[email protected]>
TYPO3-Documentation · Jun 26, 2024 · 24b30c6 · 24b30c6
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diff --git a/Documentation/Major/PostupgradeTasks/Index.rst b/Documentation/Major/PostupgradeTasks/Index.rst
@@ -13,6 +13,11 @@ Run the upgrade wizard
 
 ..  include:: UpgradeWizard.rst.txt
 
+..  note:: 
+    There is an extension :composer:`wapplersystems/core-upgrader`. It contains 
+    upgrade wizards older than two TYPO3 versions. It can be used to migrate the
+    data of installations that need to be upgraded more than two major versions at once.
+
 ..  _run_the_database_analyser:
 
 Run the database analyser