diff --git a/src/markup/engine/__tests__/remarkup/ordered-list-with-numbers.txt b/src/markup/engine/__tests__/remarkup/ordered-list-with-numbers.txt
--- a/src/markup/engine/__tests__/remarkup/ordered-list-with-numbers.txt
+++ b/src/markup/engine/__tests__/remarkup/ordered-list-with-numbers.txt
@@ -10,6 +10,10 @@
 1. asd
 234) asd
 
+10. ten
+11. eleven
+12. twelve
+
 1/ This explicitly should not be formatted as a list.
 ~~~~~~~~~~
 <ol class="remarkup-list">
@@ -24,13 +28,21 @@
 <li class="remarkup-list-item">asdf</li>
 </ol>
 
-<p>234) asd</p>
+<ol class="remarkup-list" start="234">
+<li class="remarkup-list-item">asd</li>
+</ol>
 
 <ol class="remarkup-list">
 <li class="remarkup-list-item">asd</li>
 <li class="remarkup-list-item">asd</li>
 </ol>
 
+<ol class="remarkup-list" start="10">
+<li class="remarkup-list-item">ten</li>
+<li class="remarkup-list-item">eleven</li>
+<li class="remarkup-list-item">twelve</li>
+</ol>
+
 <p>1/ This explicitly should not be formatted as a list.</p>
 ~~~~~~~~~~
 1. aasdx
@@ -40,9 +52,13 @@
   1. asdf
 2. asdf
 
-234) asd
+234. asd
 
 1. asd
 2. asd
 
+10. ten
+11. eleven
+12. twelve
+
 1/ This explicitly should not be formatted as a list.
diff --git a/src/markup/engine/remarkup/blockrule/PhutilRemarkupListBlockRule.php b/src/markup/engine/remarkup/blockrule/PhutilRemarkupListBlockRule.php
--- a/src/markup/engine/remarkup/blockrule/PhutilRemarkupListBlockRule.php
+++ b/src/markup/engine/remarkup/blockrule/PhutilRemarkupListBlockRule.php
@@ -81,7 +81,7 @@
    * the stack.
    */
   const MAXIMUM_LIST_NESTING_DEPTH = 12;
-  const START_BLOCK_PATTERN = '@^\s*(?:[-*#]+|1[.)]|\[.?\])\s+@';
+  const START_BLOCK_PATTERN = '@^\s*(?:[-*#]+|([1-9][0-9]*)[.)]|\[.?\])\s+@';
   const CONT_BLOCK_PATTERN = '@^\s*(?:[-*#]+|[0-9]+[.)]|\[.?\])\s+@';
   const STRIP_BLOCK_PATTERN = '@^\s*(?:[-*#]+|[0-9]+[.)])\s*@';
 
@@ -151,9 +151,14 @@
     //   );
 
     $item = array();
+    $starts_at = null;
     $regex = self::START_BLOCK_PATTERN;
     foreach ($lines as $line) {
-      if (preg_match($regex, $line)) {
+      $match = null;
+      if (preg_match($regex, $line, $match)) {
+        if (!$starts_at && !empty($match[1])) {
+          $starts_at = $match[1];
+        }
         $regex = self::CONT_BLOCK_PATTERN;
         if ($item) {
           $items[] = $item;
@@ -165,6 +170,9 @@
     if ($item) {
       $items[] = $item;
     }
+    if (!$starts_at) {
+      $starts_at = 1;
+    }
 
 
     // Process each item to normalize the text, remove line wrapping, and
@@ -314,7 +322,7 @@
 
     // Finally, we have enough information to render the tree.
 
-    $out = $this->renderTree($tree, 0, $has_marks);
+    $out = $this->renderTree($tree, 0, $has_marks, $starts_at);
 
     if ($this->getEngine()->isTextMode()) {
       $out = implode('', $out);
@@ -416,7 +424,12 @@
   /**
    * See additional notes in @{method:markupText}.
    */
-  private function renderTree(array $tree, $level, $has_marks) {
+  private function renderTree(
+    array $tree,
+    $level,
+    $has_marks,
+    $starts_at = 1) {
+
     $style = idx(head($tree), 'style');
 
     $out = array();
@@ -431,20 +444,27 @@
           break;
       }
 
+      $start_attr = null;
+      if (ctype_digit($starts_at) && $starts_at > 1) {
+        $start_attr = hsprintf(' start="%d"', $starts_at);
+      }
+
       if ($has_marks) {
         $out[] = hsprintf(
-          '<%s class="remarkup-list remarkup-list-with-checkmarks">',
-          $tag);
+          '<%s class="remarkup-list remarkup-list-with-checkmarks"%s>',
+          $tag,
+          $start_attr);
       } else {
         $out[] = hsprintf(
-          '<%s class="remarkup-list">',
-          $tag);
+          '<%s class="remarkup-list"%s>',
+          $tag,
+          $start_attr);
       }
 
       $out[] = "\n";
     }
 
-    $number = 1;
+    $number = $starts_at;
     foreach ($tree as $item) {
       if ($this->getEngine()->isTextMode()) {
         if ($item['text'] === null) {