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
@@ -4357,6 +4357,7 @@
     'PholioDAO' => 'applications/pholio/storage/PholioDAO.php',
     'PholioDefaultEditCapability' => 'applications/pholio/capability/PholioDefaultEditCapability.php',
     'PholioDefaultViewCapability' => 'applications/pholio/capability/PholioDefaultViewCapability.php',
+    'PholioDescriptionTransaction' => 'applications/pholio/xaction/PholioDescriptionTransaction.php',
     'PholioImage' => 'applications/pholio/storage/PholioImage.php',
     'PholioImagePHIDType' => 'applications/pholio/phid/PholioImagePHIDType.php',
     'PholioImageQuery' => 'applications/pholio/query/PholioImageQuery.php',
@@ -4393,6 +4394,7 @@
     'PholioTransaction' => 'applications/pholio/storage/PholioTransaction.php',
     'PholioTransactionComment' => 'applications/pholio/storage/PholioTransactionComment.php',
     'PholioTransactionQuery' => 'applications/pholio/query/PholioTransactionQuery.php',
+    'PholioTransactionType' => 'applications/pholio/xaction/PholioTransactionType.php',
     'PholioTransactionView' => 'applications/pholio/view/PholioTransactionView.php',
     'PholioUploadedImageView' => 'applications/pholio/view/PholioUploadedImageView.php',
     'PhortuneAccount' => 'applications/phortune/storage/PhortuneAccount.php',
@@ -9890,6 +9892,7 @@
     'PholioDAO' => 'PhabricatorLiskDAO',
     'PholioDefaultEditCapability' => 'PhabricatorPolicyCapability',
     'PholioDefaultViewCapability' => 'PhabricatorPolicyCapability',
+    'PholioDescriptionTransaction' => 'PholioTransactionType',
     'PholioImage' => array(
       'PholioDAO',
       'PhabricatorMarkupInterface',
@@ -9940,9 +9943,10 @@
     'PholioRemarkupRule' => 'PhabricatorObjectRemarkupRule',
     'PholioReplyHandler' => 'PhabricatorApplicationTransactionReplyHandler',
     'PholioSchemaSpec' => 'PhabricatorConfigSchemaSpec',
-    'PholioTransaction' => 'PhabricatorApplicationTransaction',
+    'PholioTransaction' => 'PhabricatorModularTransaction',
     'PholioTransactionComment' => 'PhabricatorApplicationTransactionComment',
     'PholioTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
+    'PholioTransactionType' => 'PhabricatorModularTransactionType',
     'PholioTransactionView' => 'PhabricatorApplicationTransactionView',
     'PholioUploadedImageView' => 'AphrontView',
     'PhortuneAccount' => array(
diff --git a/src/applications/pholio/controller/PholioMockEditController.php b/src/applications/pholio/controller/PholioMockEditController.php
--- a/src/applications/pholio/controller/PholioMockEditController.php
+++ b/src/applications/pholio/controller/PholioMockEditController.php
@@ -66,7 +66,7 @@
       $xactions = array();
 
       $type_name = PholioTransaction::TYPE_NAME;
-      $type_desc = PholioTransaction::TYPE_DESCRIPTION;
+      $type_desc = PholioDescriptionTransaction::TRANSACTIONTYPE;
       $type_view = PhabricatorTransactions::TYPE_VIEW_POLICY;
       $type_edit = PhabricatorTransactions::TYPE_EDIT_POLICY;
       $type_cc   = PhabricatorTransactions::TYPE_SUBSCRIBERS;
diff --git a/src/applications/pholio/editor/PholioMockEditor.php b/src/applications/pholio/editor/PholioMockEditor.php
--- a/src/applications/pholio/editor/PholioMockEditor.php
+++ b/src/applications/pholio/editor/PholioMockEditor.php
@@ -30,7 +30,6 @@
     $types[] = PhabricatorTransactions::TYPE_EDIT_POLICY;
 
     $types[] = PholioTransaction::TYPE_NAME;
-    $types[] = PholioTransaction::TYPE_DESCRIPTION;
     $types[] = PholioTransaction::TYPE_STATUS;
     $types[] = PholioTransaction::TYPE_INLINE;
 
@@ -50,8 +49,6 @@
     switch ($xaction->getTransactionType()) {
       case PholioTransaction::TYPE_NAME:
         return $object->getName();
-      case PholioTransaction::TYPE_DESCRIPTION:
-        return $object->getDescription();
       case PholioTransaction::TYPE_STATUS:
         return $object->getStatus();
       case PholioTransaction::TYPE_IMAGE_FILE:
@@ -96,7 +93,6 @@
 
     switch ($xaction->getTransactionType()) {
       case PholioTransaction::TYPE_NAME:
-      case PholioTransaction::TYPE_DESCRIPTION:
       case PholioTransaction::TYPE_STATUS:
       case PholioTransaction::TYPE_IMAGE_NAME:
       case PholioTransaction::TYPE_IMAGE_DESCRIPTION:
@@ -215,9 +211,6 @@
           $object->setOriginalName($xaction->getNewValue());
         }
         break;
-      case PholioTransaction::TYPE_DESCRIPTION:
-        $object->setDescription($xaction->getNewValue());
-        break;
       case PholioTransaction::TYPE_STATUS:
         $object->setStatus($xaction->getNewValue());
         break;
@@ -311,7 +304,6 @@
     $type = $u->getTransactionType();
     switch ($type) {
       case PholioTransaction::TYPE_NAME:
-      case PholioTransaction::TYPE_DESCRIPTION:
       case PholioTransaction::TYPE_STATUS:
         return $v;
       case PholioTransaction::TYPE_IMAGE_REPLACE:
diff --git a/src/applications/pholio/lipsum/PhabricatorPholioMockTestDataGenerator.php b/src/applications/pholio/lipsum/PhabricatorPholioMockTestDataGenerator.php
--- a/src/applications/pholio/lipsum/PhabricatorPholioMockTestDataGenerator.php
+++ b/src/applications/pholio/lipsum/PhabricatorPholioMockTestDataGenerator.php
@@ -24,7 +24,7 @@
     $changes = array();
     $changes[PholioTransaction::TYPE_NAME] =
       $this->generateTitle();
-    $changes[PholioTransaction::TYPE_DESCRIPTION] =
+    $changes[PholioDescriptionTransaction::TRANSACTIONTYPE] =
       $this->generateDescription();
     $changes[PhabricatorTransactions::TYPE_VIEW_POLICY] =
       PhabricatorPolicies::POLICY_PUBLIC;
diff --git a/src/applications/pholio/storage/PholioTransaction.php b/src/applications/pholio/storage/PholioTransaction.php
--- a/src/applications/pholio/storage/PholioTransaction.php
+++ b/src/applications/pholio/storage/PholioTransaction.php
@@ -1,10 +1,9 @@
 <?php
 
-final class PholioTransaction extends PhabricatorApplicationTransaction {
+final class PholioTransaction extends PhabricatorModularTransaction {
 
   // Edits to the high level mock
   const TYPE_NAME         = 'name';
-  const TYPE_DESCRIPTION  = 'description';
   const TYPE_STATUS       = 'status';
 
   // Edits to images within the mock
@@ -26,6 +25,10 @@
     return 'pholio';
   }
 
+  public function getBaseTransactionClass() {
+    return 'PholioTransactionType';
+  }
+
   public function getApplicationTransactionType() {
     return PholioMockPHIDType::TYPECONST;
   }
@@ -67,8 +70,6 @@
     $old = $this->getOldValue();
 
     switch ($this->getTransactionType()) {
-      case self::TYPE_DESCRIPTION:
-        return ($old === null);
       case self::TYPE_IMAGE_NAME:
       case self::TYPE_IMAGE_DESCRIPTION:
         return ($old === array(null => null));
@@ -89,7 +90,6 @@
       case self::TYPE_INLINE:
         return 'fa-comment';
       case self::TYPE_NAME:
-      case self::TYPE_DESCRIPTION:
       case self::TYPE_STATUS:
         if ($new == PholioMock::STATUS_CLOSED) {
           return 'fa-ban';
@@ -119,7 +119,7 @@
         $tags[] = self::MAILTAG_STATUS;
         break;
       case self::TYPE_NAME:
-      case self::TYPE_DESCRIPTION:
+      case PholioDescriptionTransaction::TRANSACTIONTYPE:
       case self::TYPE_IMAGE_NAME:
       case self::TYPE_IMAGE_DESCRIPTION:
       case self::TYPE_IMAGE_SEQUENCE:
@@ -156,11 +156,6 @@
             $new);
         }
         break;
-      case self::TYPE_DESCRIPTION:
-        return pht(
-          "%s updated the mock's description.",
-          $this->renderHandleLink($author_phid));
-        break;
       case self::TYPE_STATUS:
         if ($new == PholioMock::STATUS_CLOSED) {
           return pht(
@@ -268,12 +263,6 @@
             $new);
         }
         break;
-      case self::TYPE_DESCRIPTION:
-        return pht(
-          '%s updated the description for %s.',
-          $this->renderHandleLink($author_phid),
-          $this->renderHandleLink($object_phid));
-        break;
       case self::TYPE_STATUS:
         if ($new == PholioMock::STATUS_CLOSED) {
           return pht(
@@ -340,30 +329,6 @@
     return $text;
   }
 
-  public function hasChangeDetails() {
-    switch ($this->getTransactionType()) {
-      case self::TYPE_DESCRIPTION:
-      case self::TYPE_IMAGE_DESCRIPTION:
-        return true;
-    }
-    return parent::hasChangeDetails();
-  }
-
-  public function renderChangeDetails(PhabricatorUser $viewer) {
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-    if ($this->getTransactionType() ==
-        self::TYPE_IMAGE_DESCRIPTION) {
-      $old = reset($old);
-      $new = reset($new);
-    }
-
-    return $this->renderTextCorpusChangeDetails(
-      $viewer,
-      $old,
-      $new);
-  }
-
   public function getColor() {
     $old = $this->getOldValue();
     $new = $this->getNewValue();
diff --git a/src/applications/pholio/xaction/PholioDescriptionTransaction.php b/src/applications/pholio/xaction/PholioDescriptionTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/pholio/xaction/PholioDescriptionTransaction.php
@@ -0,0 +1,47 @@
+<?php
+
+final class PholioDescriptionTransaction
+  extends PholioTransactionType {
+
+  const TRANSACTIONTYPE = 'description';
+
+  public function generateOldValue($object) {
+    return $object->getDescription();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setDescription($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      "%s updated the mock's description.",
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s updated the description for %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+  public function shouldHide() {
+    $old = $this->getOldValue();
+    return ($old === null);
+  }
+
+  public function hasChangeDetailView() {
+    return true;
+  }
+
+  public function newChangeDetailView() {
+    $viewer = $this->getViewer();
+
+    return id(new PhabricatorApplicationTransactionTextDiffDetailView())
+      ->setViewer($viewer)
+      ->setOldText($this->getOldValue())
+      ->setNewText($this->getNewValue());
+  }
+
+}
diff --git a/src/applications/pholio/xaction/PholioTransactionType.php b/src/applications/pholio/xaction/PholioTransactionType.php
new file mode 100644
--- /dev/null
+++ b/src/applications/pholio/xaction/PholioTransactionType.php
@@ -0,0 +1,4 @@
+<?php
+
+abstract class PholioTransactionType
+  extends PhabricatorModularTransactionType {}