diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 75c8f771c3..5f3caa6a35 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -353,6 +353,7 @@ phutil_register_library_map(array(
     'PhabricatorProjectProfileController' => 'applications/project/controller/profile',
     'PhabricatorRedirectController' => 'applications/base/controller/redirect',
     'PhabricatorRemarkupRuleDifferential' => 'infrastructure/markup/remarkup/markuprule/differential',
+    'PhabricatorRemarkupRuleDiffusion' => 'infrastructure/markup/remarkup/markuprule/diffusion',
     'PhabricatorRemarkupRuleManiphest' => 'infrastructure/markup/remarkup/markuprule/maniphest',
     'PhabricatorRepository' => 'applications/repository/storage/repository',
     'PhabricatorRepositoryArcanistProject' => 'applications/repository/storage/arcanistproject',
@@ -728,6 +729,7 @@ phutil_register_library_map(array(
     'PhabricatorProjectProfileController' => 'PhabricatorProjectController',
     'PhabricatorRedirectController' => 'PhabricatorController',
     'PhabricatorRemarkupRuleDifferential' => 'PhutilRemarkupRule',
+    'PhabricatorRemarkupRuleDiffusion' => 'PhutilRemarkupRule',
     'PhabricatorRemarkupRuleManiphest' => 'PhutilRemarkupRule',
     'PhabricatorRepository' => 'PhabricatorRepositoryDAO',
     'PhabricatorRepositoryArcanistProject' => 'PhabricatorRepositoryDAO',
diff --git a/src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php b/src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php
index 0764af8c36..1eefbb60a1 100644
--- a/src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php
+++ b/src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php
@@ -28,6 +28,7 @@ class DifferentialMarkupEngineFactory {
     $rules[] = new PhutilRemarkupRuleHyperlink();
 
     $rules[] = new PhabricatorRemarkupRuleDifferential();
+    $rules[] = new PhabricatorRemarkupRuleDiffusion();
     $rules[] = new PhabricatorRemarkupRuleManiphest();
 
     $rules[] = new PhutilRemarkupRuleEscapeHTML();
diff --git a/src/applications/differential/parser/markup/__init__.php b/src/applications/differential/parser/markup/__init__.php
index 6ee3f666db..7bc7a32d5a 100644
--- a/src/applications/differential/parser/markup/__init__.php
+++ b/src/applications/differential/parser/markup/__init__.php
@@ -7,6 +7,7 @@
 
 
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/differential');
+phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/diffusion');
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/maniphest');
 
 phutil_require_module('phutil', 'markup/engine/remarkup');
diff --git a/src/infrastructure/markup/remarkup/markuprule/diffusion/PhabricatorRemarkupRuleDiffusion.php b/src/infrastructure/markup/remarkup/markuprule/diffusion/PhabricatorRemarkupRuleDiffusion.php
new file mode 100644
index 0000000000..2b5651baa2
--- /dev/null
+++ b/src/infrastructure/markup/remarkup/markuprule/diffusion/PhabricatorRemarkupRuleDiffusion.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @group markup
+ */
+class PhabricatorRemarkupRuleDiffusion
+  extends PhutilRemarkupRule {
+
+  public function apply($text) {
+    return preg_replace_callback(
+      '@\br([A-Z]+[a-z0-9]+)\b@',
+      array($this, 'markupDiffusionLink'),
+      $text);
+  }
+
+  public function markupDiffusionLink($matches) {
+    return $this->getEngine()->storeText(
+      '<a href="/r'.$matches[1].'">r'.$matches[1].'</a>');
+  }
+
+}
diff --git a/src/infrastructure/markup/remarkup/markuprule/diffusion/__init__.php b/src/infrastructure/markup/remarkup/markuprule/diffusion/__init__.php
new file mode 100644
index 0000000000..6a97fcbf90
--- /dev/null
+++ b/src/infrastructure/markup/remarkup/markuprule/diffusion/__init__.php
@@ -0,0 +1,12 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phutil', 'markup/engine/remarkup/markuprule/base');
+
+
+phutil_require_source('PhabricatorRemarkupRuleDiffusion.php');