diff --git a/.arcconfig b/.arcconfig
index 4ecf2640194..dec83771f39 100644
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,5 +1,7 @@
 {
 	"repository.callsign" : "S",
 	"phabricator.uri" : "https://reviews.freebsd.org/",
-	"history.immutable" : true
+	"history.immutable" : true,
+	"arc.land.onto.default": "main",
+	"arc.land.onto": ["main"]
 }