diff --git a/src/applications/project/remarkup/ProjectRemarkupRule.php b/src/applications/project/remarkup/ProjectRemarkupRule.php
index 2f93a88e95..ca11a7ea8c 100644
--- a/src/applications/project/remarkup/ProjectRemarkupRule.php
+++ b/src/applications/project/remarkup/ProjectRemarkupRule.php
@@ -1,62 +1,62 @@
 <?php
 
 final class ProjectRemarkupRule extends PhabricatorObjectRemarkupRule {
 
   protected function getObjectNamePrefix() {
     return '#';
   }
 
   protected function renderObjectRef($object, $handle, $anchor, $id) {
     if ($this->getEngine()->isTextMode()) {
       return '#'.$id;
     }
 
     return $handle->renderTag();
   }
 
   protected function getObjectIDPattern() {
     // NOTE: This explicitly does not match strings which contain only
     // digits, because digit strings like "#123" are used to reference tasks at
     // Facebook and are somewhat conventional in general.
 
     // The latter half of this rule matches monograms with internal periods,
     // like `#domain.com`, but does not match monograms with terminal periods,
     // because they're probably just puncutation.
 
     // Broadly, this will not match every possible project monogram, and we
     // accept some false negatives -- like `#1` or `#dot.` -- in order to avoid
     // a bunch of false positives on general use of the `#` character.
 
     // In other contexts, the PhabricatorProjectProjectPHIDType pattern is
     // controlling and these names should parse correctly.
 
-    return '[^\s.\d!,:;{}#]+(?:[^\s!,:;{}#][^\s.!,:;{}#]+)*';
+    return '[^\s.\d!,:;{}#\(\)]+(?:[^\s!,:;{}#\(\)][^\s.!,:;{}#\(\)]+)*';
   }
 
   protected function loadObjects(array $ids) {
     $viewer = $this->getEngine()->getConfig('viewer');
 
     // Put the "#" back on the front of these IDs.
     $names = array();
     foreach ($ids as $id) {
       $names[] = '#'.$id;
     }
 
     // Issue a query by object name.
     $query = id(new PhabricatorObjectQuery())
       ->setViewer($viewer)
       ->withNames($names);
 
     $query->execute();
     $projects = $query->getNamedResults();
 
     // Slice the "#" off again.
     $result = array();
     foreach ($projects as $name => $project) {
       $result[substr($name, 1)] = $project;
     }
 
     return $result;
   }
 
 }
diff --git a/src/applications/project/remarkup/__tests__/ProjectRemarkupRuleTestCase.php b/src/applications/project/remarkup/__tests__/ProjectRemarkupRuleTestCase.php
index 4e72514b26..4efc98a5b8 100644
--- a/src/applications/project/remarkup/__tests__/ProjectRemarkupRuleTestCase.php
+++ b/src/applications/project/remarkup/__tests__/ProjectRemarkupRuleTestCase.php
@@ -1,57 +1,82 @@
 <?php
 
 final class ProjectRemarkupRuleTestCase extends PhabricatorTestCase {
 
   public function testProjectObjectRemarkup() {
     $cases = array(
       'I like #ducks.' => array(
         'embed' => array(),
         'ref' => array(
           array(
             'offset' => 8,
             'id' => 'ducks',
           ),
         ),
       ),
       'We should make a post on #blog.example.com tomorrow.' => array(
         'embed' => array(),
         'ref' => array(
           array(
             'offset' => 26,
             'id' => 'blog.example.com',
           ),
         ),
       ),
       'We should make a post on #blog.example.com.' => array(
         'embed' => array(),
         'ref' => array(
           array(
             'offset' => 26,
             'id' => 'blog.example.com',
           ),
         ),
       ),
       '#123' => array(
         'embed' => array(),
         'ref' => array(),
       ),
       '#security#123' => array(
         'embed' => array(),
         'ref' => array(
           array(
             'offset' => 1,
             'id' => 'security',
             'tail' => '123',
           ),
         ),
       ),
+
+      // Don't match a terminal parenthesis. This fixes these constructs in
+      // natural language.
+      'There is some documentation (see #guides).' => array(
+        'embed' => array(),
+        'ref' => array(
+          array(
+            'offset' => 34,
+            'id' => 'guides',
+          ),
+        ),
+      ),
+
+      // Don't match internal parentheses either. This makes the terminal
+      // parenthesis behavior less arbitrary (otherwise, we match open
+      // parentheses but not closing parentheses, which is surprising).
+      '#a(b)c' => array(
+        'embed' => array(),
+        'ref' => array(
+          array(
+            'offset' => 1,
+            'id' => 'a',
+          ),
+        ),
+      ),
     );
 
     foreach ($cases as $input => $expect) {
       $rule = new ProjectRemarkupRule();
       $matches = $rule->extractReferences($input);
       $this->assertEqual($expect, $matches, $input);
     }
   }
 
 }