diff --git a/src/events/constant/type/ArcanistEventType.php b/src/events/constant/type/ArcanistEventType.php
index ea8abb5c..e9ce052d 100644
--- a/src/events/constant/type/ArcanistEventType.php
+++ b/src/events/constant/type/ArcanistEventType.php
@@ -17,4 +17,7 @@
  */
 
 final class ArcanistEventType extends PhutilEventType {
+
+  const TYPE_COMMIT_WILLCOMMITSVN = 'commit.willCommitSVN';
+
 }
diff --git a/src/workflow/commit/ArcanistCommitWorkflow.php b/src/workflow/commit/ArcanistCommitWorkflow.php
index cd4a8829..b6413044 100644
--- a/src/workflow/commit/ArcanistCommitWorkflow.php
+++ b/src/workflow/commit/ArcanistCommitWorkflow.php
@@ -101,6 +101,8 @@ EOTEXT
       }
     }
 
+    $this->revisionID = $revision_id;
+
     $revision = null;
     try {
       $revision = $conduit->callMethodSynchronous(
@@ -139,6 +141,17 @@ EOTEXT
         'edit'        => false,
       ));
 
+    $event = new PhutilEvent(
+      ArcanistEventType::TYPE_COMMIT_WILLCOMMITSVN,
+      array(
+        'message' => $message,
+        'workflow' => $this
+      )
+    );
+    PhutilEventEngine::dispatchEvent($event);
+
+    $message = $event->getValue('message');
+
     if ($this->getArgument('show')) {
       echo $message;
       return 0;
@@ -173,8 +186,6 @@ EOTEXT
       ));
     $mark_workflow->run();
 
-    $this->revisionID = $revision_id;
-
     return $err;
   }
 
diff --git a/src/workflow/commit/__init__.php b/src/workflow/commit/__init__.php
index a63499f8..40166f22 100644
--- a/src/workflow/commit/__init__.php
+++ b/src/workflow/commit/__init__.php
@@ -6,12 +6,15 @@
 
 
 
+phutil_require_module('arcanist', 'events/constant/type');
 phutil_require_module('arcanist', 'exception/usage');
 phutil_require_module('arcanist', 'exception/usage/userabort');
 phutil_require_module('arcanist', 'repository/api/base');
 phutil_require_module('arcanist', 'workflow/base');
 
 phutil_require_module('phutil', 'console');
+phutil_require_module('phutil', 'events/engine');
+phutil_require_module('phutil', 'events/event');
 phutil_require_module('phutil', 'filesystem');
 phutil_require_module('phutil', 'future/exec');
 phutil_require_module('phutil', 'utils');