diff --git a/src/applications/audit/editor/PhabricatorAuditCommentEditor.php b/src/applications/audit/editor/PhabricatorAuditCommentEditor.php
index 60b8a7f878..357ad2dd5d 100644
--- a/src/applications/audit/editor/PhabricatorAuditCommentEditor.php
+++ b/src/applications/audit/editor/PhabricatorAuditCommentEditor.php
@@ -291,4 +291,14 @@ final class PhabricatorAuditCommentEditor extends PhabricatorEditor {
     return $reply_handler;
   }
 
+  public static function getMailThreading(
+    PhabricatorRepository $repository,
+    PhabricatorRepositoryCommit $commit) {
+
+    return array(
+      'diffusion-audit-'.$commit->getPHID(),
+      'Commit r'.$repository->getCallsign().$commit->getCommitIdentifier(),
+    );
+  }
+
 }