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
@@ -30,7 +30,7 @@ final class ProjectRemarkupRule extends PhabricatorObjectRemarkupRule {
     // 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) {
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
@@ -45,6 +45,31 @@ final class ProjectRemarkupRuleTestCase extends PhabricatorTestCase {
           ),
         ),
       ),
+
+      // 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) {