diff --git a/doc/sphinx-guides/source/api/dataaccess.rst b/doc/sphinx-guides/source/api/dataaccess.rst
index e76ea167587..6a726cdc7b9 100755
--- a/doc/sphinx-guides/source/api/dataaccess.rst
+++ b/doc/sphinx-guides/source/api/dataaccess.rst
@@ -83,7 +83,7 @@ Basic access URI:
 
 ``/api/access/datafile/$id``
 
-.. note:: Files can be accessed using persistent identifiers. This is done by passing the constant ``:persistentId`` where the numeric id of the file is expected, and then passing the actual persistent id as a query parameter with the name ``persistentId``.
+.. note:: Files can be accessed using persistent identifiers. This is done by passing the constant ``:persistentId`` where the numeric id of the file is expected, and then passing the actual persistent id as a query parameter with the name ``persistentId``. However, this file access method is only effective when the FilePIDsEnabled option is enabled, which can be authorized by the admin. For further information, refer to :ref:`:FilePIDsEnabled`. 
 
   Example: Getting the file whose DOI is *10.5072/FK2/J8SJZB* ::