diff --git a/UPDATING b/UPDATING
index 56af1257a8d7..d79a4b0b8281 100644
--- a/UPDATING
+++ b/UPDATING
@@ -92,6 +92,9 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
 	a reboot is required after installing the new kernel before
 	installing world.  
 
+	Users using META_MODE to build should also use -DNO_META_IGNORE_HOST
+	to 'make' for the first build after upgrading.
+
 20170424:
 	The NATM framework including the en(4), fatm(4), hatm(4), and
 	patm(4) devices has been removed.  Consumers should plan a