diff --git a/code/Controllers/CMSPageHistoryController.php b/code/Controllers/CMSPageHistoryController.php
index c9cee5df..c3073427 100644
--- a/code/Controllers/CMSPageHistoryController.php
+++ b/code/Controllers/CMSPageHistoryController.php
@@ -21,6 +21,11 @@ use SilverStripe\Security\Security;
 use SilverStripe\View\ArrayData;
 use SilverStripe\View\ViewableData;
 
+/**
+ * Legacy CMS History controller. This functionality has been moved to the `silverstripe/versioned-admin` module and
+ * this class will be removed completly in SilverStripe 5.0.0.
+ * @deprecated 4.3.0:5.0.0
+ */
 class CMSPageHistoryController extends CMSMain
 {