diff --git a/src/workflow/ArcanistDiffWorkflow.php b/src/workflow/ArcanistDiffWorkflow.php
index 6b510863..d285f87f 100644
--- a/src/workflow/ArcanistDiffWorkflow.php
+++ b/src/workflow/ArcanistDiffWorkflow.php
@@ -428,7 +428,10 @@ EOTEXT
 
     $this->dispatchEvent(
       ArcanistEventType::TYPE_DIFF_DIDBUILDMESSAGE,
-      array());
+      array(
+        'message' => $commit_message
+      )
+    );
 
     if (!$this->shouldOnlyCreateDiff()) {
       $revision = $this->buildRevisionFromCommitMessage($commit_message);