diff --git a/sm5/smartd.conf b/sm5/smartd.conf
index 6ebba4f65801184a13726d71246300a0ad87b5ff..461765b50bda6eb9c3e6d843876caf43cea14cb5 100644
--- a/sm5/smartd.conf
+++ b/sm5/smartd.conf
@@ -33,6 +33,7 @@ DEVICESCAN
 # HERE IS A LIST OF DIRECTIVES FOR THIS CONFIGURATION FILE
 #   -A    Device is an ATA device
 #   -S    Device is a SCSI device
+#   -C N  Check disks every N seconds.  N must be 10 or greater
 #   -c    Monitor SMART Health Status
 #   -l    Monitor SMART Error Log for changes
 #   -L    Monitor SMART Self-Test Log for new errors
@@ -46,3 +47,6 @@ DEVICESCAN
 #    \    Line continuation character
 # Attribute ID is a decimal integer 1 <= ID <= 255
 # All but -S directive are only implemented for ATA devices
+#
+# If the test string DEVICESCAN is the first uncommented text
+# then smartd will scan for devices /dev/hd[a-l] and /dev/sd[a-z]