diff --git a/docs/using.rst b/docs/using.rst
index 6d8130886..78e4c6d37 100644
--- a/docs/using.rst
+++ b/docs/using.rst
@@ -163,6 +163,9 @@ sure that UI doesn't prompt for any details you can add the command to
 ``crontab`` (make it less than every 90 days to avoid problems, say
 every month).
 
+Please note that the CA will send notification emails to the address
+you provide if you do not renew certificates that are about to expire.
+
 Let's Encrypt is working hard on automating the renewal process. Until
 the tool is ready, we are sorry for the inconvenience!