diff --git a/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_29.rst b/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_29.rst
index 31ff27511..e1f2eabec 100644
--- a/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_29.rst
+++ b/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_29.rst
@@ -33,6 +33,11 @@ Removed globals
 
 * Global ``autosize`` is removed, it was deprecated for over 4 years and scheduled for removal with Nextcloud 20. If you still need it you should ship your own version.
 
+Deprecated APIs
+^^^^^^^^^^^^^^^
+
+* ``OC.dialogs.fileexists`` is deprecated. Use ``openConflictPicker`` from `@nextcloud/upload <https://nextcloud-libraries.github.io/nextcloud-upload/functions/openConflictPicker.html>`_ instead.
+
 Back-end changes
 ----------------
 
diff --git a/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_30.rst b/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_30.rst
index 981af136a..59c943204 100644
--- a/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_30.rst
+++ b/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_30.rst
@@ -20,6 +20,12 @@ Removed APIs
 Removed globals
 ^^^^^^^^^^^^^^^
 
+Deprecated APIs
+^^^^^^^^^^^^^^^
+
+* ``OC.dialogs.fileexists`` was already deprecated in Nextcloud 29, but is now also marked as such.
+  Use ``openConflictPicker`` from `@nextcloud/upload <https://nextcloud-libraries.github.io/nextcloud-upload/functions/openConflictPicker.html>`_ instead.
+
 Back-end changes
 ----------------