Index: src/applications/diffusion/engine/DiffusionCommitHookEngine.php
===================================================================
--- src/applications/diffusion/engine/DiffusionCommitHookEngine.php
+++ src/applications/diffusion/engine/DiffusionCommitHookEngine.php
@@ -26,6 +26,7 @@
   private $transactionKey;
   private $mercurialHook;
   private $mercurialCommits = array();
+  private $gitCommits = array();
 
   private $heraldViewerProjects;
 
@@ -427,6 +428,7 @@
         $merge_base = rtrim($stdout, "\n");
       }
 
+      $ref_update = $ref_updates[$key];
       $ref_update->setMergeBase($merge_base);
     }
 
@@ -525,7 +527,20 @@
 
       $commits = phutil_split_lines($stdout, $retain_newlines = false);
 
+      // If we're looking at a branch, mark all of the new commits as on that
+      // branch. It's only possible for these commits to be on updated branches,
+      // since any other branch heads are necessarily behind them.
+      $branch_name = null;
+      $ref_update = $ref_updates[$key];
+      $type_branch = PhabricatorRepositoryPushLog::REFTYPE_BRANCH;
+      if ($ref_update->getRefType() == $type_branch) {
+        $branch_name = $ref_update->getRefName();
+      }
+
       foreach ($commits as $commit) {
+        if ($branch_name) {
+          $this->gitCommits[$commit][] = $branch_name;
+        }
         $content_updates[$commit] = $this->newPushLog()
           ->setRefType(PhabricatorRepositoryPushLog::REFTYPE_COMMIT)
           ->setRefNew($commit)
@@ -973,5 +988,19 @@
     }
   }
 
+  public function loadBranches($identifier) {
+    $repository = $this->getRepository();
+    $vcs = $repository->getVersionControlSystem();
+    switch ($vcs) {
+      case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
+        return idx($this->gitCommits, $identifier, array());
+      case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
+        return idx($this->mercurialCommits, $identifier, array());
+      case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
+        // Subversion doesn't have branches.
+        return array();
+    }
+  }
+
 
 }
Index: src/applications/diffusion/herald/HeraldPreCommitContentAdapter.php
===================================================================
--- src/applications/diffusion/herald/HeraldPreCommitContentAdapter.php
+++ src/applications/diffusion/herald/HeraldPreCommitContentAdapter.php
@@ -42,6 +42,7 @@
         self::FIELD_BODY,
         self::FIELD_AUTHOR,
         self::FIELD_COMMITTER,
+        self::FIELD_BRANCHES,
         self::FIELD_DIFF_FILE,
         self::FIELD_DIFF_CONTENT,
         self::FIELD_DIFF_ADDED_CONTENT,
@@ -100,6 +101,8 @@
         return $this->getAuthorPHID();
       case self::FIELD_COMMITTER:
         return $this->getCommitterPHID();
+      case self::FIELD_BRANCHES:
+        return $this->getBranches();
       case self::FIELD_DIFF_FILE:
         return $this->getDiffContent('name');
       case self::FIELD_DIFF_CONTENT:
@@ -329,4 +332,8 @@
     }
   }
 
+  private function getBranches() {
+    return $this->hookEngine->loadBranches($this->log->getRefNew());
+  }
+
 }
Index: src/applications/herald/adapter/HeraldAdapter.php
===================================================================
--- src/applications/herald/adapter/HeraldAdapter.php
+++ src/applications/herald/adapter/HeraldAdapter.php
@@ -33,6 +33,7 @@
   const FIELD_DIFFERENTIAL_CCS       = 'differential-ccs';
   const FIELD_DIFFERENTIAL_ACCEPTED  = 'differential-accepted';
   const FIELD_IS_MERGE_COMMIT        = 'is-merge-commit';
+  const FIELD_BRANCHES               = 'branches';
 
   const CONDITION_CONTAINS        = 'contains';
   const CONDITION_NOT_CONTAINS    = '!contains';
@@ -178,6 +179,7 @@
       self::FIELD_DIFFERENTIAL_ACCEPTED
         => pht('Accepted Differential revision'),
       self::FIELD_IS_MERGE_COMMIT => pht('Commit is a merge'),
+      self::FIELD_BRANCHES => pht('Commit\'s branches'),
     );
   }
 
@@ -255,6 +257,7 @@
           self::CONDITION_NOT_EXISTS,
         );
       case self::FIELD_DIFF_FILE:
+      case self::FIELD_BRANCHES:
         return array(
           self::CONDITION_CONTAINS,
           self::CONDITION_REGEXP,