diff --git a/UPDATING b/UPDATING
index 99af0ed243b4..013a1a085628 100644
--- a/UPDATING
+++ b/UPDATING
@@ -26,6 +26,10 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 10.x IS SLOW:
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20130308:
+	CTL_DISABLE has also been added to the sparc64 GENERIC (for further
+	information, see the respective 20130304 entry).
+
 20130304:
 	Recent commits to callout(9) changed the size of struct callout,
 	so the KBI is probably heavily disturbed. Also, some functions
diff --git a/sys/sparc64/conf/GENERIC b/sys/sparc64/conf/GENERIC
index 79124abc4109..e19f17cc03ef 100644
--- a/sys/sparc64/conf/GENERIC
+++ b/sys/sparc64/conf/GENERIC
@@ -122,6 +122,9 @@ device		cd		# CD
 device		pass		# Passthrough device (direct ATA/SCSI access)
 device		ses		# Enclosure Services (SES and SAF-TE)
 device		ctl		# CAM Target Layer
+options 	CTL_DISABLE	# Disable CTL by default to save memory.
+				# Re-enable with kern.cam.ctl.disable=0 in
+				# /boot/loader.conf
 
 # RAID controllers
 #device		amr		# AMI MegaRAID