diff --git a/src/calibre/db/cache.py b/src/calibre/db/cache.py
index 45e0cab61b..358130c3a2 100644
--- a/src/calibre/db/cache.py
+++ b/src/calibre/db/cache.py
@@ -686,6 +686,7 @@ class Cache:
         ' Return all notes data as a dict or None if note does not exist '
         return self.backend.notes_data_for(field, item_id)
 
+    @read_api
     def get_all_items_that_have_notes(self, field_name=None) -> set[int] | dict[str, int]:
         ' Return all item_ids for items that have notes in the specified field or all fields if field_name is None '
         return self.backend.get_all_items_that_have_notes(field_name)