diff --git a/UPDATING b/UPDATING
index e285c7d1893f..9f21bd5efe7d 100644
--- a/UPDATING
+++ b/UPDATING
@@ -36,6 +36,10 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 13.x IS SLOW:
 	scenarios have been tested and fixed, but rebuilding kernels without
 	rebuilding world may fail.
 
+	The ZFS cache file has moved from /boot to /etc to match the OpenZFS
+	upstream default. This means your zpool won't auto import until you
+	upgrade your /etc/rc.d files or you import them manually.
+
 20200824:
 	The resume code now notifies devd with the 'kernel' system
 	rather than the old 'kern' subsystem to be consistent with