diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index c9e68a18..3ba4f008 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1,166 +1,168 @@
 <?php
 
 /**
  * This file is automatically generated. Use 'phutil_mapper.php' to rebuild it.
  * @generated
  */
 
 phutil_register_library_map(array(
   'class' =>
   array(
     'CommandException' => 'future/exec',
     'ConduitClient' => 'conduit/client',
     'ConduitClientException' => 'conduit/client',
     'ConduitFuture' => 'conduit/client',
     'ExecFuture' => 'future/exec',
     'FileFinder' => 'filesystem/filefinder',
     'FileList' => 'filesystem/filelist',
     'Filesystem' => 'filesystem',
     'FilesystemException' => 'filesystem',
     'Future' => 'future',
     'FutureIterator' => 'future',
     'FutureProxy' => 'future/proxy',
     'HTTPFuture' => 'future/http',
     'HTTPSFuture' => 'future/https',
     'LinesOfALargeFile' => 'filesystem/linesofalargefile',
     'MFilterTestHelper' => 'utils/__tests__',
     'PhutilConsoleFormatter' => 'console',
     'PhutilDaemon' => 'daemon/base',
     'PhutilDaemonOverseer' => 'daemon/overseer',
     'PhutilDefaultSyntaxHighlighterEngine' => 'markup/syntax/engine/default',
     'PhutilDocblockParser' => 'parser/docblock',
     'PhutilDocblockParserTestCase' => 'parser/docblock/__tests__',
     'PhutilErrorHandler' => 'error',
     'PhutilFatalDaemon' => 'daemon/torture/fatal',
     'PhutilHangForeverDaemon' => 'daemon/torture/hangforever',
     'PhutilInteractiveEditor' => 'console/editor',
     'PhutilMarkupEngine' => 'markup/engine',
     'PhutilMissingSymbolException' => 'symbols/exception/missing',
     'PhutilNiceDaemon' => 'daemon/torture/nice',
     'PhutilProcessGroupDaemon' => 'daemon/torture/processgroup',
     'PhutilReadableSerializer' => 'readableserializer',
     'PhutilRemarkupBlockStorage' => 'markup/engine/remarkup/blockstorage',
     'PhutilRemarkupEngine' => 'markup/engine/remarkup',
     'PhutilRemarkupEngineBlockRule' => 'markup/engine/remarkup/blockrule/base',
     'PhutilRemarkupEngineRemarkupCodeBlockRule' => 'markup/engine/remarkup/blockrule/remarkupcode',
     'PhutilRemarkupEngineRemarkupDefaultBlockRule' => 'markup/engine/remarkup/blockrule/remarkupdefault',
     'PhutilRemarkupEngineRemarkupHeaderBlockRule' => 'markup/engine/remarkup/blockrule/remarkupheader',
     'PhutilRemarkupEngineRemarkupInlineBlockRule' => 'markup/engine/remarkup/blockrule/remarkupinline',
     'PhutilRemarkupEngineRemarkupListBlockRule' => 'markup/engine/remarkup/blockrule/remarkuplist',
+    'PhutilRemarkupEngineRemarkupNoteBlockRule' => 'markup/engine/remarkup/blockrule/remarkupnote',
     'PhutilRemarkupEngineRemarkupQuotesBlockRule' => 'markup/engine/remarkup/blockrule/remarkupquotes',
     'PhutilRemarkupEngineTestCase' => 'markup/engine/remarkup/__tests__',
     'PhutilRemarkupRule' => 'markup/engine/remarkup/markuprule/base',
     'PhutilRemarkupRuleBold' => 'markup/engine/remarkup/markuprule/bold',
     'PhutilRemarkupRuleEscapeHTML' => 'markup/engine/remarkup/markuprule/escapehtml',
     'PhutilRemarkupRuleEscapeRemarkup' => 'markup/engine/remarkup/markuprule/escaperemarkup',
     'PhutilRemarkupRuleHyperlink' => 'markup/engine/remarkup/markuprule/hyperlink',
     'PhutilRemarkupRuleItalic' => 'markup/engine/remarkup/markuprule/italics',
     'PhutilRemarkupRuleLinebreaks' => 'markup/engine/remarkup/markuprule/linebreaks',
     'PhutilRemarkupRuleMonospace' => 'markup/engine/remarkup/markuprule/monospace',
     'PhutilSaturateStdoutDaemon' => 'daemon/torture/saturatestdout',
     'PhutilServiceProfiler' => 'serviceprofiler',
     'PhutilSymbolLoader' => 'symbols',
     'PhutilSyntaxHighlighter' => 'markup/syntax/highlighter/base',
     'PhutilSyntaxHighlighterEngine' => 'markup/syntax/engine/base',
     'PhutilTortureTestDaemon' => 'daemon/torture/base',
     'PhutilURI' => 'parser/uri',
     'PhutilUtilsTestCase' => 'utils/__tests__',
     'PhutilXHPASTSyntaxHighlighter' => 'markup/syntax/highlighter/xhpast',
     'TempFile' => 'filesystem/tempfile',
     'XHPASTNode' => 'parser/xhpast/api/node',
     'XHPASTNodeList' => 'parser/xhpast/api/list',
     'XHPASTSyntaxErrorException' => 'parser/xhpast/api/exception',
     'XHPASTToken' => 'parser/xhpast/api/token',
     'XHPASTTree' => 'parser/xhpast/api/tree',
     'XHPASTTreeTestCase' => 'parser/xhpast/api/tree/__tests__',
   ),
   'function' =>
   array(
     'Futures' => 'future',
     'array_mergev' => 'utils',
     'array_select_keys' => 'utils',
     'coalesce' => 'utils',
     'csprintf' => 'xsprintf/csprintf',
     'exec_manual' => 'future/exec',
     'execx' => 'future/exec',
     'head' => 'utils',
     'id' => 'utils',
     'idx' => 'utils',
     'ifilter' => 'utils',
     'igroup' => 'utils',
     'ipull' => 'utils',
     'isort' => 'utils',
     'jsprintf' => 'xsprintf/jsprintf',
     'mfilter' => 'utils',
     'mgroup' => 'utils',
     'mpull' => 'utils',
     'msort' => 'utils',
     'newv' => 'utils',
     'nonempty' => 'utils',
     'phlog' => 'error',
     'phutil_autoload_class' => 'autoload',
     'phutil_console_confirm' => 'console',
     'phutil_console_format' => 'console',
     'phutil_console_prompt' => 'console',
     'phutil_console_wrap' => 'console',
     'phutil_deprecated' => 'moduleutils',
     'phutil_error_listener_example' => 'error',
     'phutil_escape_html' => 'markup',
     'phutil_escape_uri' => 'markup',
     'phutil_get_library_name_for_root' => 'moduleutils',
     'phutil_get_library_root' => 'moduleutils',
     'phutil_get_library_root_for_path' => 'moduleutils',
     'phutil_is_utf8' => 'utils',
     'phutil_passthru' => 'future/exec',
     'phutil_render_tag' => 'markup',
     'phutil_utf8ize' => 'utils',
     'vcsprintf' => 'xsprintf/csprintf',
     'vjsprintf' => 'xsprintf/jsprintf',
     'xhp_parser_node_constants' => 'parser/xhpast/constants',
     'xhpast_get_binary_path' => 'parser/xhpast/bin',
     'xhpast_get_build_instructions' => 'parser/xhpast/bin',
     'xhpast_get_parser_future' => 'parser/xhpast/bin',
     'xhpast_is_available' => 'parser/xhpast/bin',
     'xhpast_parser_token_constants' => 'parser/xhpast/constants',
     'xsprintf' => 'xsprintf',
     'xsprintf_callback_example' => 'xsprintf',
     'xsprintf_command' => 'xsprintf/csprintf',
     'xsprintf_javascript' => 'xsprintf/jsprintf',
   ),
   'requires_class' =>
   array(
     'ConduitFuture' => 'FutureProxy',
     'ExecFuture' => 'Future',
     'FutureProxy' => 'Future',
     'HTTPFuture' => 'Future',
     'HTTPSFuture' => 'Future',
     'PhutilDefaultSyntaxHighlighterEngine' => 'PhutilSyntaxHighlighterEngine',
     'PhutilDocblockParserTestCase' => 'ArcanistPhutilTestCase',
     'PhutilFatalDaemon' => 'PhutilTortureTestDaemon',
     'PhutilHangForeverDaemon' => 'PhutilTortureTestDaemon',
     'PhutilNiceDaemon' => 'PhutilTortureTestDaemon',
     'PhutilProcessGroupDaemon' => 'PhutilTortureTestDaemon',
     'PhutilRemarkupEngine' => 'PhutilMarkupEngine',
     'PhutilRemarkupEngineRemarkupCodeBlockRule' => 'PhutilRemarkupEngineBlockRule',
     'PhutilRemarkupEngineRemarkupDefaultBlockRule' => 'PhutilRemarkupEngineBlockRule',
     'PhutilRemarkupEngineRemarkupHeaderBlockRule' => 'PhutilRemarkupEngineBlockRule',
     'PhutilRemarkupEngineRemarkupInlineBlockRule' => 'PhutilRemarkupEngineBlockRule',
     'PhutilRemarkupEngineRemarkupListBlockRule' => 'PhutilRemarkupEngineBlockRule',
+    'PhutilRemarkupEngineRemarkupNoteBlockRule' => 'PhutilRemarkupEngineBlockRule',
     'PhutilRemarkupEngineRemarkupQuotesBlockRule' => 'PhutilRemarkupEngineBlockRule',
     'PhutilRemarkupEngineTestCase' => 'ArcanistPhutilTestCase',
     'PhutilRemarkupRuleBold' => 'PhutilRemarkupRule',
     'PhutilRemarkupRuleEscapeHTML' => 'PhutilRemarkupRule',
     'PhutilRemarkupRuleEscapeRemarkup' => 'PhutilRemarkupRule',
     'PhutilRemarkupRuleHyperlink' => 'PhutilRemarkupRule',
     'PhutilRemarkupRuleItalic' => 'PhutilRemarkupRule',
     'PhutilRemarkupRuleLinebreaks' => 'PhutilRemarkupRule',
     'PhutilRemarkupRuleMonospace' => 'PhutilRemarkupRule',
     'PhutilSaturateStdoutDaemon' => 'PhutilTortureTestDaemon',
     'PhutilTortureTestDaemon' => 'PhutilDaemon',
     'PhutilUtilsTestCase' => 'ArcanistPhutilTestCase',
     'XHPASTTreeTestCase' => 'ArcanistPhutilTestCase',
   ),
   'requires_interface' =>
   array(
   ),
 ));
diff --git a/src/markup/engine/remarkup/__tests__/PhutilRemarkupEngineTestCase.php b/src/markup/engine/remarkup/__tests__/PhutilRemarkupEngineTestCase.php
index a039da78..1f17b2b0 100644
--- a/src/markup/engine/remarkup/__tests__/PhutilRemarkupEngineTestCase.php
+++ b/src/markup/engine/remarkup/__tests__/PhutilRemarkupEngineTestCase.php
@@ -1,80 +1,81 @@
 <?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.
  */
 
 /**
  * Test cases for @{class:PhutilRemarkupEngine}.
  *
  * @group testcase
  */
 class PhutilRemarkupEngineTestCase extends ArcanistPhutilTestCase {
 
   public function testEngine() {
     $root = dirname(__FILE__).'/data/';
     foreach (Filesystem::listDirectory($root, $hidden = false) as $file) {
       $this->markupText($root.$file);
     }
   }
 
   private function markupText($markup_file) {
     $contents = Filesystem::readFile($markup_file);
     $file = basename($markup_file);
 
     $parts = explode("\n~~~~~~~~~~\n", $contents);
     $this->assertEqual(2, count($parts));
 
     list($input_remarkup, $expected_output) = $parts;
 
     $engine = $this->buildNewTestEngine();
 
     $actual_output = $engine->markupText($input_remarkup);
 
     $this->assertEqual(
       $expected_output,
       $actual_output,
       "Failed to markup file '{$file}'.");
   }
 
   private function buildNewTestEngine() {
     $engine = new PhutilRemarkupEngine();
 
     $rules = array();
     $rules[] = new PhutilRemarkupRuleEscapeRemarkup();
     $rules[] = new PhutilRemarkupRuleHyperlink();
     $rules[] = new PhutilRemarkupRuleEscapeHTML();
     $rules[] = new PhutilRemarkupRuleMonospace();
     $rules[] = new PhutilRemarkupRuleBold();
     $rules[] = new PhutilRemarkupRuleItalic();
 
     $blocks = array();
     $blocks[] = new PhutilRemarkupEngineRemarkupHeaderBlockRule();
     $blocks[] = new PhutilRemarkupEngineRemarkupListBlockRule();
     $blocks[] = new PhutilRemarkupEngineRemarkupCodeBlockRule();
+    $blocks[] = new PhutilRemarkupEngineRemarkupNoteBlockRule();
     $blocks[] = new PhutilRemarkupEngineRemarkupDefaultBlockRule();
 
     foreach ($blocks as $block) {
       if (!($block instanceof PhutilRemarkupEngineRemarkupCodeBlockRule)) {
         $block->setMarkupRules($rules);
       }
     }
 
     $engine->setBlockRules($blocks);
 
     return $engine;
   }
 
 }
diff --git a/src/markup/engine/remarkup/__tests__/__init__.php b/src/markup/engine/remarkup/__tests__/__init__.php
index 89b05a5b..92f69241 100644
--- a/src/markup/engine/remarkup/__tests__/__init__.php
+++ b/src/markup/engine/remarkup/__tests__/__init__.php
@@ -1,25 +1,26 @@
 <?php
 /**
  * This file is automatically generated. Lint this module to rebuild it.
  * @generated
  */
 
 
 
 phutil_require_module('arcanist', 'unit/engine/phutil/testcase');
 
 phutil_require_module('phutil', 'filesystem');
 phutil_require_module('phutil', 'markup/engine/remarkup');
 phutil_require_module('phutil', 'markup/engine/remarkup/blockrule/remarkupcode');
 phutil_require_module('phutil', 'markup/engine/remarkup/blockrule/remarkupdefault');
 phutil_require_module('phutil', 'markup/engine/remarkup/blockrule/remarkupheader');
 phutil_require_module('phutil', 'markup/engine/remarkup/blockrule/remarkuplist');
+phutil_require_module('phutil', 'markup/engine/remarkup/blockrule/remarkupnote');
 phutil_require_module('phutil', 'markup/engine/remarkup/markuprule/bold');
 phutil_require_module('phutil', 'markup/engine/remarkup/markuprule/escapehtml');
 phutil_require_module('phutil', 'markup/engine/remarkup/markuprule/escaperemarkup');
 phutil_require_module('phutil', 'markup/engine/remarkup/markuprule/hyperlink');
 phutil_require_module('phutil', 'markup/engine/remarkup/markuprule/italics');
 phutil_require_module('phutil', 'markup/engine/remarkup/markuprule/monospace');
 
 
 phutil_require_source('PhutilRemarkupEngineTestCase.php');
diff --git a/src/markup/engine/remarkup/__tests__/data/note.txt b/src/markup/engine/remarkup/__tests__/data/note.txt
new file mode 100755
index 00000000..6ff78a0d
--- /dev/null
+++ b/src/markup/engine/remarkup/__tests__/data/note.txt
@@ -0,0 +1,3 @@
+NOTE: interesting stuff
+~~~~~~~~~~
+<div class="remarkup-note">NOTE: interesting stuff</div>
\ No newline at end of file
diff --git a/src/markup/engine/remarkup/blockrule/remarkupnote/PhutilRemarkupEngineRemarkupNoteBlockRule.php b/src/markup/engine/remarkup/blockrule/remarkupnote/PhutilRemarkupEngineRemarkupNoteBlockRule.php
new file mode 100644
index 00000000..e9a779c3
--- /dev/null
+++ b/src/markup/engine/remarkup/blockrule/remarkupnote/PhutilRemarkupEngineRemarkupNoteBlockRule.php
@@ -0,0 +1,39 @@
+<?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 PhutilRemarkupEngineRemarkupNoteBlockRule
+  extends PhutilRemarkupEngineBlockRule {
+
+  public function getBlockPattern() {
+    return "/^NOTE: /";
+  }
+
+  public function shouldMergeBlocks() {
+    return false;
+  }
+
+  public function markupText($text) {
+    return
+      '<div class="remarkup-note">'.
+        $this->applyRules($text).
+      '</div>';
+  }
+}
diff --git a/src/markup/engine/remarkup/blockrule/remarkupnote/__init__.php b/src/markup/engine/remarkup/blockrule/remarkupnote/__init__.php
new file mode 100644
index 00000000..f0bfa454
--- /dev/null
+++ b/src/markup/engine/remarkup/blockrule/remarkupnote/__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/blockrule/base');
+
+
+phutil_require_source('PhutilRemarkupEngineRemarkupNoteBlockRule.php');