diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1542,6 +1542,7 @@
     'PhabricatorCommitBranchesField' => 'applications/repository/customfield/PhabricatorCommitBranchesField.php',
     'PhabricatorCommitCustomField' => 'applications/repository/customfield/PhabricatorCommitCustomField.php',
     'PhabricatorCommitMergedCommitsField' => 'applications/repository/customfield/PhabricatorCommitMergedCommitsField.php',
+    'PhabricatorCommitRepositoryField' => 'applications/repository/customfield/PhabricatorCommitRepositoryField.php',
     'PhabricatorCommitSearchEngine' => 'applications/audit/query/PhabricatorCommitSearchEngine.php',
     'PhabricatorCommitTagsField' => 'applications/repository/customfield/PhabricatorCommitTagsField.php',
     'PhabricatorCommonPasswords' => 'applications/auth/constants/PhabricatorCommonPasswords.php',
@@ -4908,6 +4909,7 @@
     'PhabricatorCommitBranchesField' => 'PhabricatorCommitCustomField',
     'PhabricatorCommitCustomField' => 'PhabricatorCustomField',
     'PhabricatorCommitMergedCommitsField' => 'PhabricatorCommitCustomField',
+    'PhabricatorCommitRepositoryField' => 'PhabricatorCommitCustomField',
     'PhabricatorCommitSearchEngine' => 'PhabricatorApplicationSearchEngine',
     'PhabricatorCommitTagsField' => 'PhabricatorCommitCustomField',
     'PhabricatorCommonPasswords' => 'Phobject',
diff --git a/src/applications/diffusion/config/PhabricatorDiffusionConfigOptions.php b/src/applications/diffusion/config/PhabricatorDiffusionConfigOptions.php
--- a/src/applications/diffusion/config/PhabricatorDiffusionConfigOptions.php
+++ b/src/applications/diffusion/config/PhabricatorDiffusionConfigOptions.php
@@ -23,6 +23,7 @@
     $custom_field_type = 'custom:PhabricatorCustomFieldConfigOptionType';
 
     $fields = array(
+      new PhabricatorCommitRepositoryField(),
       new PhabricatorCommitBranchesField(),
       new PhabricatorCommitTagsField(),
       new PhabricatorCommitMergedCommitsField(),
@@ -142,10 +143,11 @@
       $this->newOption('diffusion.fields', $custom_field_type, $default_fields)
         ->setCustomData(
           id(new PhabricatorRepositoryCommit())
-          ->getCustomFieldBaseClass())
-        ->setDescription(pht(
-          "Select and reorder diffusion fields.\n\n".
-          "These will primarily show up in Mail Notifications.")),
+            ->getCustomFieldBaseClass())
+        ->setDescription(
+          pht(
+            "Select and reorder diffusion fields.\n\n".
+            "These will primarily show up in Mail Notifications.")),
     );
   }
 
diff --git a/src/applications/repository/customfield/PhabricatorCommitRepositoryField.php b/src/applications/repository/customfield/PhabricatorCommitRepositoryField.php
new file mode 100644
--- /dev/null
+++ b/src/applications/repository/customfield/PhabricatorCommitRepositoryField.php
@@ -0,0 +1,30 @@
+<?php
+
+final class PhabricatorCommitRepositoryField
+  extends PhabricatorCommitCustomField {
+
+  public function getFieldKey() {
+    return 'diffusion:repository';
+  }
+
+  public function shouldDisableByDefault() {
+    return true;
+  }
+
+  public function shouldAppearInTransactionMail() {
+    return true;
+  }
+
+  public function updateTransactionMailBody(
+    PhabricatorMetaMTAMailBody $body,
+    PhabricatorApplicationTransactionEditor $editor,
+    array $xactions) {
+
+    $repository = $this->getObject()->getRepository();
+
+    $body->addTextSection(
+      pht('REPOSITORY'),
+      $repository->getMonogram().' '.$repository->getName());
+  }
+
+}