diff --git a/admin-guide/operations/certificates.rst b/admin-guide/operations/certificates.rst
index fd4cc6d6..08a192c9 100644
--- a/admin-guide/operations/certificates.rst
+++ b/admin-guide/operations/certificates.rst
@@ -43,7 +43,8 @@ and ``$ALIASES``::
     /usr/bin/openssl req -new -config $FQDN.cnf -keyout $FQDN.key -out $FQDN.csr
 
 
-Finally, `submit the CSR <https://www.digicert.com/secure/requests/products?guest_key=11dqrl7540p3t4jm4qhnvsnzjkvk>`_.
+Finally, `submit the CSR <https://www.digicert.com/secure/requests/products?guest_key=11dqrl7540p3t4jm4qhnvsnzjkvk>`_. Please note
+that the URL will work when accessed from PSI network (e.g. VPN).
 
 DigiCert will send an email including instructions on how to download the
 certificate.