diff --git a/UPDATING b/UPDATING
index 7275a5601087..c7345f1ac080 100644
--- a/UPDATING
+++ b/UPDATING
@@ -16,6 +16,19 @@ from older versions of FreeBSD, try WITHOUT_CLANG to bootstrap to the tip of
 stable/10, and then rebuild without this option. The bootstrap process from
 older version of current is a bit fragile.
 
+20170824:
+	Since the switch to GPT disk labels, fsck for UFS/FFS has been
+	unable to automatically find alternate superblocks. As of r322860,
+	the information needed to find alternate superblocks has been
+	moved to the end of the area reserved for the boot block.
+	Filesystems created with a newfs of this vintage or later
+	will create the recovery information. If you have a filesystem
+	created prior to this change and wish to have a recovery block
+	created for your filesystem, you can do so by running fsck in
+	forground mode (i.e., do not use the -p or -y options). As it
+	starts, fsck will ask ``SAVE DATA TO FIND ALTERNATE SUPERBLOCKS''
+	to which you should answer yes.
+
 20170511:
 	The mmcsd.ko module now additionally depends on geom_flashmap.ko.
 	Also, mmc.ko and mmcsd.ko need to be a matching pair built from the