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
@@ -3630,6 +3630,7 @@
     'PhabricatorProjectListController' => 'applications/project/controller/PhabricatorProjectListController.php',
     'PhabricatorProjectListView' => 'applications/project/view/PhabricatorProjectListView.php',
     'PhabricatorProjectLockController' => 'applications/project/controller/PhabricatorProjectLockController.php',
+    'PhabricatorProjectLockTransaction' => 'applications/project/xaction/PhabricatorProjectLockTransaction.php',
     'PhabricatorProjectLogicalAncestorDatasource' => 'applications/project/typeahead/PhabricatorProjectLogicalAncestorDatasource.php',
     'PhabricatorProjectLogicalDatasource' => 'applications/project/typeahead/PhabricatorProjectLogicalDatasource.php',
     'PhabricatorProjectLogicalOrNotDatasource' => 'applications/project/typeahead/PhabricatorProjectLogicalOrNotDatasource.php',
@@ -9048,6 +9049,7 @@
     'PhabricatorProjectListController' => 'PhabricatorProjectController',
     'PhabricatorProjectListView' => 'AphrontView',
     'PhabricatorProjectLockController' => 'PhabricatorProjectController',
+    'PhabricatorProjectLockTransaction' => 'PhabricatorProjectTransactionType',
     'PhabricatorProjectLogicalAncestorDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
     'PhabricatorProjectLogicalDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
     'PhabricatorProjectLogicalOrNotDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
diff --git a/src/applications/project/controller/PhabricatorProjectLockController.php b/src/applications/project/controller/PhabricatorProjectLockController.php
--- a/src/applications/project/controller/PhabricatorProjectLockController.php
+++ b/src/applications/project/controller/PhabricatorProjectLockController.php
@@ -49,7 +49,8 @@
       }
 
       $xactions[] = id(new PhabricatorProjectTransaction())
-        ->setTransactionType(PhabricatorProjectTransaction::TYPE_LOCKED)
+        ->setTransactionType(
+            PhabricatorProjectLockTransaction::TRANSACTIONTYPE)
         ->setNewValue($new_value);
 
       $editor = id(new PhabricatorProjectTransactionEditor())
diff --git a/src/applications/project/editor/PhabricatorProjectTransactionEditor.php b/src/applications/project/editor/PhabricatorProjectTransactionEditor.php
--- a/src/applications/project/editor/PhabricatorProjectTransactionEditor.php
+++ b/src/applications/project/editor/PhabricatorProjectTransactionEditor.php
@@ -30,7 +30,6 @@
     $types[] = PhabricatorTransactions::TYPE_EDIT_POLICY;
     $types[] = PhabricatorTransactions::TYPE_JOIN_POLICY;
 
-    $types[] = PhabricatorProjectTransaction::TYPE_LOCKED;
     $types[] = PhabricatorProjectTransaction::TYPE_PARENT;
     $types[] = PhabricatorProjectTransaction::TYPE_MILESTONE;
     $types[] = PhabricatorProjectTransaction::TYPE_HASWORKBOARD;
@@ -46,8 +45,6 @@
     PhabricatorApplicationTransaction $xaction) {
 
     switch ($xaction->getTransactionType()) {
-      case PhabricatorProjectTransaction::TYPE_LOCKED:
-        return (int)$object->getIsMembershipLocked();
       case PhabricatorProjectTransaction::TYPE_HASWORKBOARD:
         return (int)$object->getHasWorkboard();
       case PhabricatorProjectTransaction::TYPE_PARENT:
@@ -69,7 +66,6 @@
     PhabricatorApplicationTransaction $xaction) {
 
     switch ($xaction->getTransactionType()) {
-      case PhabricatorProjectTransaction::TYPE_LOCKED:
       case PhabricatorProjectTransaction::TYPE_PARENT:
       case PhabricatorProjectTransaction::TYPE_MILESTONE:
       case PhabricatorProjectTransaction::TYPE_DEFAULT_SORT:
@@ -93,9 +89,6 @@
     PhabricatorApplicationTransaction $xaction) {
 
     switch ($xaction->getTransactionType()) {
-      case PhabricatorProjectTransaction::TYPE_LOCKED:
-        $object->setIsMembershipLocked($xaction->getNewValue());
-        return;
       case PhabricatorProjectTransaction::TYPE_PARENT:
         $object->setParentProjectPHID($xaction->getNewValue());
         return;
@@ -129,7 +122,6 @@
     $new = $xaction->getNewValue();
 
     switch ($xaction->getTransactionType()) {
-      case PhabricatorProjectTransaction::TYPE_LOCKED:
       case PhabricatorProjectTransaction::TYPE_PARENT:
       case PhabricatorProjectTransaction::TYPE_MILESTONE:
       case PhabricatorProjectTransaction::TYPE_HASWORKBOARD:
@@ -320,7 +312,7 @@
           $object,
           PhabricatorPolicyCapability::CAN_EDIT);
         return;
-      case PhabricatorProjectTransaction::TYPE_LOCKED:
+      case PhabricatorProjectLockTransaction::TRANSACTIONTYPE:
         PhabricatorPolicyFilter::requireCapability(
           $this->requireActor(),
           newv($this->getEditorApplicationClass(), array()),
diff --git a/src/applications/project/storage/PhabricatorProjectTransaction.php b/src/applications/project/storage/PhabricatorProjectTransaction.php
--- a/src/applications/project/storage/PhabricatorProjectTransaction.php
+++ b/src/applications/project/storage/PhabricatorProjectTransaction.php
@@ -3,7 +3,6 @@
 final class PhabricatorProjectTransaction
   extends PhabricatorModularTransaction {
 
-  const TYPE_LOCKED     = 'project:locked';
   const TYPE_PARENT = 'project:parent';
   const TYPE_MILESTONE = 'project:milestone';
   const TYPE_HASWORKBOARD = 'project:hasworkboard';
@@ -87,16 +86,7 @@
   }
 
   public function getIcon() {
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-
     switch ($this->getTransactionType()) {
-      case self::TYPE_LOCKED:
-        if ($new) {
-          return 'fa-lock';
-        } else {
-          return 'fa-unlock';
-        }
       case self::TYPE_MEMBERS:
         return 'fa-user';
     }
@@ -115,18 +105,6 @@
           '%s created this project.',
           $this->renderHandleLink($author_phid));
 
-      case self::TYPE_LOCKED:
-        if ($new) {
-          return pht(
-            "%s locked this project's membership.",
-            $author_handle);
-        } else {
-          return pht(
-            "%s unlocked this project's membership.",
-            $author_handle);
-        }
-        break;
-
       case self::TYPE_MEMBERS:
         $add = array_diff($new, $old);
         $rem = array_diff($old, $new);
@@ -196,33 +174,6 @@
     return parent::getTitle();
   }
 
-  public function getTitleForFeed() {
-    $author_phid = $this->getAuthorPHID();
-    $object_phid = $this->getObjectPHID();
-    $author_handle = $this->renderHandleLink($author_phid);
-    $object_handle = $this->renderHandleLink($object_phid);
-
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-
-    switch ($this->getTransactionType()) {
-      case self::TYPE_LOCKED:
-        if ($new) {
-          return pht(
-            '%s locked membership for %s.',
-            $author_handle,
-            $object_handle);
-        } else {
-          return pht(
-            '%s unlocked membership for %s.',
-            $author_handle,
-            $object_handle);
-        }
-    }
-
-    return parent::getTitleForFeed();
-  }
-
   public function getMailTags() {
     $tags = array();
     switch ($this->getTransactionType()) {
@@ -247,7 +198,7 @@
         }
         break;
       case PhabricatorProjectStatusTransaction::TRANSACTIONTYPE:
-      case self::TYPE_LOCKED:
+      case PhabricatorProjectLockTransaction::TRANSACTIONTYPE:
       default:
         $tags[] = self::MAILTAG_OTHER;
         break;
diff --git a/src/applications/project/xaction/PhabricatorProjectLockTransaction.php b/src/applications/project/xaction/PhabricatorProjectLockTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/xaction/PhabricatorProjectLockTransaction.php
@@ -0,0 +1,56 @@
+<?php
+
+final class PhabricatorProjectLockTransaction
+  extends PhabricatorProjectTransactionType {
+
+  const TRANSACTIONTYPE = 'project:locked';
+
+  public function generateOldValue($object) {
+    return (int)$object->getIsMembershipLocked();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setIsMembershipLocked($value);
+  }
+
+  public function getTitle() {
+    $new = $this->getNewValue();
+
+    if ($new) {
+      return pht(
+        "%s locked this project's membership.",
+        $this->renderAuthor());
+    } else {
+      return pht(
+        "%s unlocked this project's membership.",
+        $this->renderAuthor());
+    }
+  }
+
+  public function getTitleForFeed() {
+    $new = $this->getNewValue();
+
+    if ($new) {
+      return pht(
+        '%s locked %s membership.',
+        $this->renderAuthor(),
+        $this->renderObject());
+    } else {
+      return pht(
+        '%s unlocked %s membership.',
+        $this->renderAuthor(),
+        $this->renderObject());
+    }
+  }
+
+  public function getIcon() {
+    $new = $this->getNewValue();
+
+    if ($new) {
+      return 'fa-lock';
+    } else {
+      return 'fa-unlock';
+    }
+  }
+
+}