diff --git a/.arcconfig b/.arcconfig
index b1f1a9b..3743d4b 100644
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,4 +1,6 @@
 {
   "project_id" : "peru",
-  "conduit_uri" : "https://phabricator.buildinspace.com"
+  "conduit_uri" : "https://phabricator.buildinspace.com",
+  "arc.feature.start.default" : "origin/master",
+  "git.default-relative-commit": "HEAD^"
 }