diff --git a/src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php b/src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php
index a65712a83a..15ed808532 100644
--- a/src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php
+++ b/src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php
@@ -38,6 +38,7 @@ class DifferentialMarkupEngineFactory {
     $rules[] = new PhutilRemarkupRuleItalic();
 
     $blocks = array();
+    $blocks[] = new PhutilRemarkupEngineRemarkupQuotesBlockRule();
     $blocks[] = new PhutilRemarkupEngineRemarkupHeaderBlockRule();
     $blocks[] = new PhutilRemarkupEngineRemarkupListBlockRule();
     $blocks[] = new PhutilRemarkupEngineRemarkupCodeBlockRule();
diff --git a/src/applications/differential/parser/markup/__init__.php b/src/applications/differential/parser/markup/__init__.php
index 4df4f32823..3bd80e23da 100644
--- a/src/applications/differential/parser/markup/__init__.php
+++ b/src/applications/differential/parser/markup/__init__.php
@@ -16,6 +16,7 @@ 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/remarkupquotes');
 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');
diff --git a/webroot/rsrc/css/core/remarkup.css b/webroot/rsrc/css/core/remarkup.css
index 26eaaf57cb..3a37b64be1 100644
--- a/webroot/rsrc/css/core/remarkup.css
+++ b/webroot/rsrc/css/core/remarkup.css
@@ -40,3 +40,11 @@
 .phabricator-remarkup h2 {
   margin: .75em 0 .5em;
 }
+
+.phabricator-remarkup blockquote {
+  border-left: 1px solid #AAAAAA;
+  color:       #333333;
+  font-style:  italic;
+  margin:      .5em 0em;
+  padding:     .25em 1em;
+}