Index: head/UPDATING
===================================================================
--- head/UPDATING
+++ head/UPDATING
@@ -2203,9 +2203,11 @@
 
 	2.) update the ZFS boot block on your boot drive
 
-	The following example updates the ZFS boot block on the first
-	partition (freebsd-boot) of a GPT partitioned drive ada0:
-	"gpart bootcode -p /boot/gptzfsboot -i 1 ada0"
+	The following example updates the ZFS boot block on the
+	freebsd-boot partition of a GPT partitioned drive ada0:
+	"gpart bootcode -p /boot/gptzfsboot -i $N ada0"
+	The value $N will typically be 1 (if booting from BIOS) or 2 (if
+	booting from EFI).
 
 	Non-boot pools do not need these updates.