diff --git a/src/applications/differential/editor/DifferentialTransactionEditor.php b/src/applications/differential/editor/DifferentialTransactionEditor.php
--- a/src/applications/differential/editor/DifferentialTransactionEditor.php
+++ b/src/applications/differential/editor/DifferentialTransactionEditor.php
@@ -1248,6 +1248,10 @@
       $diff = $this->requireDiff($update_xaction->getNewValue(), true);
 
       $body->addTextSection(
+        pht('BRANCH'),
+        $diff->getBranch());
+
+      $body->addTextSection(
         pht('AFFECTED FILES'),
         $this->renderAffectedFilesForMail($diff));