diff --git a/docs/rolereference.rst b/docs/rolereference.rst
index ba935e59874e3eb54243975d93fb55f8c0fde385..ccd94bd0068ea43c3f230414e1515229d1b3c357 100644
--- a/docs/rolereference.rst
+++ b/docs/rolereference.rst
@@ -282,7 +282,9 @@ The role implements the following:
 * Sets-up system for performing checks on certificates (currently only if they
   expire within less than 30 days). Roles that want their certificates checked
   should deploy a ``.conf`` to directory ``/etc/check_certificate/`` with paths
-  to certificate files, one per line. Certificates are checked on daily basis.
+  to certificate files, one per line. Certificates are checked on
+  daily basis, using crontab (resulting in failures being sent out to
+  the ``root`` user).
 * Deploys ``apticron`` package that performs checks for available package
   upgrades on daily basis. Mails are delivered to local ``root`` account, and
   can be redirected elsewhere via aliases. If using ``mail_forwarder`` or