diff --git a/.arcconfig b/.arcconfig
index af7e7dc849c2..4ecf2640194e 100644
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,4 +1,5 @@
 {
+	"repository.callsign" : "S",
 	"phabricator.uri" : "https://reviews.freebsd.org/",
 	"history.immutable" : true
 }