diff --git a/.arcconfig b/.arcconfig
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,4 +1,5 @@
 {
     "phabricator.uri" : "https://phabricator-dev.allizom.org/",
-    "repository.callsign": "TEST"
+    "repository.callsign": "TEST",
+    "history.immutable": false
 }
diff --git a/new-file b/new-file
--- a/new-file
+++ b/new-file
@@ -1 +1 @@
-testing
+more testing