diff --git a/src/applications/transactions/engine/PhabricatorTimelineEngine.php b/src/applications/transactions/engine/PhabricatorTimelineEngine.php
--- a/src/applications/transactions/engine/PhabricatorTimelineEngine.php
+++ b/src/applications/transactions/engine/PhabricatorTimelineEngine.php
@@ -84,6 +84,7 @@
 
     return $view
       ->setViewer($viewer)
+      ->setObject($object)
       ->setObjectPHID($object->getPHID())
       ->setTransactions($xactions);
   }
diff --git a/src/applications/transactions/view/PhabricatorApplicationTransactionView.php b/src/applications/transactions/view/PhabricatorApplicationTransactionView.php
--- a/src/applications/transactions/view/PhabricatorApplicationTransactionView.php
+++ b/src/applications/transactions/view/PhabricatorApplicationTransactionView.php
@@ -9,6 +9,7 @@
   private $engine;
   private $showEditActions = true;
   private $isPreview;
+  private $object;
   private $objectPHID;
   private $shouldTerminate = false;
   private $quoteTargetID;
@@ -41,6 +42,16 @@
     return $this->quoteTargetID;
   }
 
+  public function setObject(
+    PhabricatorApplicationTransactionInterface $object) {
+    $this->object = $object;
+    return $this;
+  }
+
+  private function getObject() {
+    return $this->object;
+  }
+
   public function setObjectPHID($object_phid) {
     $this->objectPHID = $object_phid;
     return $this;
@@ -238,6 +249,12 @@
 
       $engine = id(new PhabricatorMarkupEngine())
         ->setViewer($this->getViewer());
+
+      $object = $this->getObject();
+      if ($object) {
+        $engine->setContextObject($object);
+      }
+
       foreach ($this->transactions as $xaction) {
         if (!$xaction->hasComment()) {
           continue;