diff --git a/src/applications/project/query/PhabricatorProjectSearchEngine.php b/src/applications/project/query/PhabricatorProjectSearchEngine.php
index 5df3bbeb1a..49a989eb4b 100644
--- a/src/applications/project/query/PhabricatorProjectSearchEngine.php
+++ b/src/applications/project/query/PhabricatorProjectSearchEngine.php
@@ -1,226 +1,245 @@
 <?php
 
 final class PhabricatorProjectSearchEngine
   extends PhabricatorApplicationSearchEngine {
 
   public function getResultTypeDescription() {
     return pht('Projects');
   }
 
   public function getApplicationClassName() {
     return 'PhabricatorProjectApplication';
   }
 
   public function newQuery() {
     return id(new PhabricatorProjectQuery())
       ->needImages(true);
   }
 
   protected function buildCustomSearchFields() {
     return array(
       id(new PhabricatorSearchTextField())
         ->setLabel(pht('Name'))
         ->setKey('name'),
       id(new PhabricatorUsersSearchField())
         ->setLabel(pht('Members'))
         ->setKey('memberPHIDs')
         ->setAliases(array('member', 'members')),
       id(new PhabricatorUsersSearchField())
         ->setLabel(pht('Watchers'))
         ->setKey('watcherPHIDs')
         ->setAliases(array('watcher', 'watchers')),
       id(new PhabricatorSearchSelectField())
         ->setLabel(pht('Status'))
         ->setKey('status')
         ->setOptions($this->getStatusOptions()),
       id(new PhabricatorSearchThreeStateField())
         ->setLabel(pht('Milestones'))
         ->setKey('isMilestone')
         ->setOptions(
           pht('(Show All)'),
           pht('Show Only Milestones'),
           pht('Hide Milestones'))
         ->setDescription(
           pht(
             'Pass true to find only milestones, or false to omit '.
             'milestones.')),
       id(new PhabricatorSearchCheckboxesField())
         ->setLabel(pht('Icons'))
         ->setKey('icons')
         ->setOptions($this->getIconOptions()),
       id(new PhabricatorSearchCheckboxesField())
         ->setLabel(pht('Colors'))
         ->setKey('colors')
         ->setOptions($this->getColorOptions()),
+      id(new PhabricatorPHIDsSearchField())
+        ->setLabel(pht('Parent Projects'))
+        ->setKey('parentPHIDs')
+        ->setAliases(array('parent', 'parents', 'parentPHID'))
+        ->setDescription(pht('Find direct subprojects of specified parents.')),
+      id(new PhabricatorPHIDsSearchField())
+        ->setLabel(pht('Ancestor Projects'))
+        ->setKey('ancestorPHIDs')
+        ->setAliases(array('ancestor', 'ancestors', 'ancestorPHID'))
+        ->setDescription(
+          pht('Find all subprojects beneath specified ancestors.')),
     );
   }
 
 
   protected function buildQueryFromParameters(array $map) {
     $query = $this->newQuery();
 
     if (strlen($map['name'])) {
       $tokens = PhabricatorTypeaheadDatasource::tokenizeString($map['name']);
       $query->withNameTokens($tokens);
     }
 
     if ($map['memberPHIDs']) {
       $query->withMemberPHIDs($map['memberPHIDs']);
     }
 
     if ($map['watcherPHIDs']) {
       $query->withWatcherPHIDs($map['watcherPHIDs']);
     }
 
     if ($map['status']) {
       $status = idx($this->getStatusValues(), $map['status']);
       if ($status) {
         $query->withStatus($status);
       }
     }
 
     if ($map['icons']) {
       $query->withIcons($map['icons']);
     }
 
     if ($map['colors']) {
       $query->withColors($map['colors']);
     }
 
     if ($map['isMilestone'] !== null) {
       $query->withIsMilestone($map['isMilestone']);
     }
 
+    if ($map['parentPHIDs']) {
+      $query->withParentProjectPHIDs($map['parentPHIDs']);
+    }
+
+    if ($map['ancestorPHIDs']) {
+      $query->withAncestorProjectPHIDs($map['ancestorPHIDs']);
+    }
+
     return $query;
   }
 
   protected function getURI($path) {
     return '/project/'.$path;
   }
 
   protected function getBuiltinQueryNames() {
     $names = array();
 
     if ($this->requireViewer()->isLoggedIn()) {
       $names['joined'] = pht('Joined');
     }
 
     $names['active'] = pht('Active');
     $names['all'] = pht('All');
 
     return $names;
   }
 
   public function buildSavedQueryFromBuiltin($query_key) {
     $query = $this->newSavedQuery();
     $query->setQueryKey($query_key);
 
     $viewer_phid = $this->requireViewer()->getPHID();
 
     // By default, do not show milestones in the list view.
     $query->setParameter('isMilestone', false);
 
     switch ($query_key) {
       case 'all':
         return $query;
       case 'active':
         return $query
           ->setParameter('status', 'active');
       case 'joined':
         return $query
           ->setParameter('memberPHIDs', array($viewer_phid))
           ->setParameter('status', 'active');
     }
 
     return parent::buildSavedQueryFromBuiltin($query_key);
   }
 
   private function getStatusOptions() {
     return array(
       'active'   => pht('Show Only Active Projects'),
       'archived' => pht('Show Only Archived Projects'),
       'all'      => pht('Show All Projects'),
     );
   }
 
   private function getStatusValues() {
     return array(
       'active'   => PhabricatorProjectQuery::STATUS_ACTIVE,
       'archived' => PhabricatorProjectQuery::STATUS_ARCHIVED,
       'all'      => PhabricatorProjectQuery::STATUS_ANY,
     );
   }
 
   private function getIconOptions() {
     $options = array();
 
     $set = new PhabricatorProjectIconSet();
     foreach ($set->getIcons() as $icon) {
       if ($icon->getIsDisabled()) {
         continue;
       }
 
       $options[$icon->getKey()] = array(
         id(new PHUIIconView())
           ->setIcon($icon->getIcon()),
         ' ',
         $icon->getLabel(),
       );
     }
 
     return $options;
   }
 
   private function getColorOptions() {
     $options = array();
 
     foreach (PhabricatorProjectIconSet::getColorMap() as $color => $name) {
       $options[$color] = array(
         id(new PHUITagView())
           ->setType(PHUITagView::TYPE_SHADE)
           ->setShade($color)
           ->setName($name),
       );
     }
 
     return $options;
   }
 
   protected function renderResultList(
     array $projects,
     PhabricatorSavedQuery $query,
     array $handles) {
     assert_instances_of($projects, 'PhabricatorProject');
     $viewer = $this->requireViewer();
 
     $list = id(new PhabricatorProjectListView())
       ->setUser($viewer)
       ->setProjects($projects)
       ->renderList();
 
     return id(new PhabricatorApplicationSearchResultView())
       ->setObjectList($list)
       ->setNoDataString(pht('No projects found.'));
   }
 
   protected function getNewUserBody() {
     $create_button = id(new PHUIButtonView())
       ->setTag('a')
       ->setText(pht('Create a Project'))
       ->setHref('/project/edit/')
       ->setColor(PHUIButtonView::GREEN);
 
     $icon = $this->getApplication()->getIcon();
     $app_name =  $this->getApplication()->getName();
     $view = id(new PHUIBigInfoView())
       ->setIcon($icon)
       ->setTitle(pht('Welcome to %s', $app_name))
       ->setDescription(
         pht('Projects are flexible storage containers used as '.
             'tags, teams, projects, or anything you need to group.'))
       ->addAction($create_button);
 
       return $view;
   }
 
 }