diff --git a/.arcconfig b/.arcconfig
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,4 +1,5 @@
 {
     "phabricator.uri" : "https://phabricator-dev.allizom.org/",
-    "repository.callsign": "PHABRICATORQADEV"
+    "repository.callsign": "PHABRICATORQADEV",
+    "history.immutable": false
 }
diff --git a/TEST b/TEST
new file mode 100644
--- /dev/null
+++ b/TEST
@@ -0,0 +1,1 @@
+test