diff --git a/doc/setup/cdn.rst b/doc/setup/cdn.rst
index 290a9aff400..83d0a43333d 100644
--- a/doc/setup/cdn.rst
+++ b/doc/setup/cdn.rst
@@ -37,7 +37,8 @@ Step 2: Configure the odoo instance with your zone
 
 In the Odoo back end, go to the :guilabel:`Website Settings`: menu, then
 activate the CDN support and copy/paste your zone URL in the
-:guilabel:`CDN Base URL` field.
+:guilabel:`CDN Base URL` field. This field is only visible and configurable if
+you have developer mode activated.
 
 .. image:: cdn/odoo_cdn_base_url.png
    :class: img-responsive