Index: src/__phutil_library_map__.php
===================================================================
--- src/__phutil_library_map__.php
+++ src/__phutil_library_map__.php
@@ -2188,6 +2188,7 @@
     'PhragmentPHIDTypeFragmentVersion' => 'applications/phragment/phid/PhragmentPHIDTypeFragmentVersion.php',
     'PhragmentPatchController' => 'applications/phragment/controller/PhragmentPatchController.php',
     'PhragmentPatchUtil' => 'applications/phragment/util/PhragmentPatchUtil.php',
+    'PhragmentRevertController' => 'applications/phragment/controller/PhragmentRevertController.php',
     'PhragmentUpdateController' => 'applications/phragment/controller/PhragmentUpdateController.php',
     'PhragmentVersionController' => 'applications/phragment/controller/PhragmentVersionController.php',
     'PhragmentZIPController' => 'applications/phragment/controller/PhragmentZIPController.php',
@@ -4790,6 +4791,7 @@
     'PhragmentPHIDTypeFragmentVersion' => 'PhabricatorPHIDType',
     'PhragmentPatchController' => 'PhragmentController',
     'PhragmentPatchUtil' => 'Phobject',
+    'PhragmentRevertController' => 'PhragmentController',
     'PhragmentUpdateController' => 'PhragmentController',
     'PhragmentVersionController' => 'PhragmentController',
     'PhragmentZIPController' => 'PhragmentController',
Index: src/applications/phragment/application/PhabricatorApplicationPhragment.php
===================================================================
--- src/applications/phragment/application/PhabricatorApplicationPhragment.php
+++ src/applications/phragment/application/PhabricatorApplicationPhragment.php
@@ -41,6 +41,7 @@
         'zip/(?P<dblob>.*)' => 'PhragmentZIPController',
         'version/(?P<id>[0-9]*)/' => 'PhragmentVersionController',
         'patch/(?P<aid>[0-9x]*)/(?P<bid>[0-9]*)/' => 'PhragmentPatchController',
+        'revert/(?P<id>[0-9]*)/(?P<dblob>.*)' => 'PhragmentRevertController',
       ),
     );
   }
Index: src/applications/phragment/controller/PhragmentHistoryController.php
===================================================================
--- src/applications/phragment/controller/PhragmentHistoryController.php
+++ src/applications/phragment/controller/PhragmentHistoryController.php
@@ -44,6 +44,7 @@
       ->execute();
     $files = mpull($files, null, 'getPHID');
 
+    $first = true;
     foreach ($versions as $version) {
       $item = id(new PHUIObjectItemView());
       $item->setHeader('Version '.$version->getSequence());
@@ -57,6 +58,16 @@
         $item->addAttribute('Deletion');
       }
 
+      if (!$first) {
+        $item->addAction(id(new PHUIListItemView())
+          ->setIcon('undo')
+          ->setRenderNameAsTooltip(true)
+          ->setWorkflow(true)
+          ->setName(pht("Revert to Here"))
+          ->setHref($this->getApplicationURI(
+            "revert/".$version->getID()."/".$current->getPath())));
+      }
+
       $disabled = !isset($files[$version->getFilePHID()]);
       $action = id(new PHUIListItemView())
         ->setIcon('download')
@@ -68,6 +79,8 @@
       }
       $item->addAction($action);
       $list->addItem($item);
+
+      $first = false;
     }
 
     return $this->buildApplicationPage(
Index: src/applications/phragment/controller/PhragmentRevertController.php
===================================================================
--- /dev/null
+++ src/applications/phragment/controller/PhragmentRevertController.php
@@ -0,0 +1,87 @@
+<?php
+
+final class PhragmentRevertController extends PhragmentController {
+
+  private $dblob;
+  private $id;
+
+  public function willProcessRequest(array $data) {
+    $this->dblob = $data['dblob'];
+    $this->id = $data['id'];
+  }
+
+  public function processRequest() {
+    $request = $this->getRequest();
+    $viewer = $request->getUser();
+
+    $fragment = id(new PhragmentFragmentQuery())
+      ->setViewer($viewer)
+      ->withPaths(array($this->dblob))
+      ->requireCapabilities(
+        array(
+          PhabricatorPolicyCapability::CAN_VIEW,
+          PhabricatorPolicyCapability::CAN_EDIT,
+        ))
+      ->executeOne();
+    if ($fragment === null) {
+      return new Aphront404Response();
+    }
+
+    $version = id(new PhragmentFragmentVersionQuery())
+      ->setViewer($viewer)
+      ->withFragmentPHIDs(array($fragment->getPHID()))
+      ->withIDs(array($this->id))
+      ->executeOne();
+    if ($version === null) {
+      return new Aphront404Response();
+    }
+
+    if ($request->isDialogFormPost()) {
+      $file_phid = $version->getFilePHID();
+
+      $file = null;
+      if ($file_phid !== null) {
+        $file = id(new PhabricatorFileQuery())
+          ->setViewer($viewer)
+          ->withPHIDs(array($file_phid))
+          ->executeOne();
+        if ($file === null) {
+          throw new Exception(
+            "The file associated with this version was not found.");
+        }
+      }
+
+      if ($file === null) {
+        $fragment->deleteFile($viewer);
+      } else {
+        $fragment->updateFromFile($viewer, $file);
+      }
+
+      return id(new AphrontRedirectResponse())
+        ->setURI($this->getApplicationURI('/history/'.$this->dblob));
+    }
+
+    return $this->createDialog($fragment, $version);
+  }
+
+  function createDialog(
+    PhragmentFragment $fragment,
+    PhragmentFragmentVersion $version) {
+
+    $request = $this->getRequest();
+    $viewer = $request->getUser();
+
+    $dialog = id(new AphrontDialogView())
+      ->setTitle(pht('Really revert this fragment?'))
+      ->setUser($request->getUser())
+      ->addSubmitButton(pht('Revert'))
+      ->addCancelButton(pht('Cancel'))
+      ->appendParagraph(pht(
+        "Reverting this fragment to version %d will create a new version of ".
+        "the fragment.  It will not delete any version history.",
+        $version->getSequence(),
+        $version->getSequence()));
+    return id(new AphrontDialogResponse())->setDialog($dialog);
+  }
+
+}