diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -528,7 +528,7 @@
     'rsrc/js/phui/behavior-phui-tab-group.js' => '0a0b10e9',
     'rsrc/js/phuix/PHUIXActionListView.js' => 'b5c256b8',
     'rsrc/js/phuix/PHUIXActionView.js' => '442efd08',
-    'rsrc/js/phuix/PHUIXAutocomplete.js' => 'e0731603',
+    'rsrc/js/phuix/PHUIXAutocomplete.js' => 'bb19ed2c',
     'rsrc/js/phuix/PHUIXButtonView.js' => '8a91e1ac',
     'rsrc/js/phuix/PHUIXDropdownMenu.js' => '04b2ae03',
     'rsrc/js/phuix/PHUIXExample.js' => '68af71ca',
@@ -881,7 +881,7 @@
     'phui-workpanel-view-css' => 'a3a63478',
     'phuix-action-list-view' => 'b5c256b8',
     'phuix-action-view' => '442efd08',
-    'phuix-autocomplete' => 'e0731603',
+    'phuix-autocomplete' => 'bb19ed2c',
     'phuix-button-view' => '8a91e1ac',
     'phuix-dropdown-menu' => '04b2ae03',
     'phuix-form-control-view' => '16ad6224',
@@ -1868,6 +1868,12 @@
       'javelin-uri',
       'phabricator-notification',
     ),
+    'bb19ed2c' => array(
+      'javelin-install',
+      'javelin-dom',
+      'phuix-icon-view',
+      'phabricator-prefab',
+    ),
     'bcaccd64' => array(
       'javelin-behavior',
       'javelin-behavior-device',
@@ -2033,12 +2039,6 @@
       'javelin-typeahead-ondemand-source',
       'javelin-dom',
     ),
-    'e0731603' => array(
-      'javelin-install',
-      'javelin-dom',
-      'phuix-icon-view',
-      'phabricator-prefab',
-    ),
     'e1d25dfb' => array(
       'javelin-behavior',
       'javelin-stratcom',
diff --git a/src/applications/phriction/typeahead/PhrictionDocumentDatasource.php b/src/applications/phriction/typeahead/PhrictionDocumentDatasource.php
--- a/src/applications/phriction/typeahead/PhrictionDocumentDatasource.php
+++ b/src/applications/phriction/typeahead/PhrictionDocumentDatasource.php
@@ -68,6 +68,7 @@
       $title = $content->getTitle();
 
       $sprite = 'phabricator-search-icon phui-font-fa phui-icon-view fa-book';
+      $autocomplete = '[[ '.$slug.' ]]';
 
       $result = id(new PhabricatorTypeaheadResult())
         ->setName($title)
@@ -77,6 +78,7 @@
         ->setDisplayType($slug)
         ->setPriorityType('wiki')
         ->setImageSprite($sprite)
+        ->setAutocomplete($autocomplete)
         ->setClosed($closed);
 
       $results[] = $result;
diff --git a/src/view/form/control/PhabricatorRemarkupControl.php b/src/view/form/control/PhabricatorRemarkupControl.php
--- a/src/view/form/control/PhabricatorRemarkupControl.php
+++ b/src/view/form/control/PhabricatorRemarkupControl.php
@@ -72,6 +72,8 @@
           'autocomplete' => 1,
         ));
 
+    $phriction_datasource = new PhrictionDocumentDatasource();
+
     Javelin::initBehavior(
       'phabricator-remarkup-assist',
       array(
@@ -118,6 +120,18 @@
               '/',
             ),
           ),
+          91 => array( // "["
+            'datasourceURI' => $phriction_datasource->getDatasourceURI(),
+            'headerIcon' => 'fa-book',
+            'headerText' => pht('Find Document:'),
+            'hintText' => $phriction_datasource->getPlaceholderText(),
+            'cancel' => array(
+              ':', // Cancel on "http:" and similar.
+              '|',
+              ']',
+            ),
+            'prefix' => '^\\[*',
+          ),
         ),
       ));
     Javelin::initBehavior('phabricator-tooltips', array());
diff --git a/webroot/rsrc/js/phuix/PHUIXAutocomplete.js b/webroot/rsrc/js/phuix/PHUIXAutocomplete.js
--- a/webroot/rsrc/js/phuix/PHUIXAutocomplete.js
+++ b/webroot/rsrc/js/phuix/PHUIXAutocomplete.js
@@ -335,7 +335,9 @@
     _getCancelCharacters: function() {
       // The "." character does not cancel because of projects named
       // "node.js" or "blog.mycompany.com".
-      return ['#', '@', ',', '!', '?', '{', '}'];
+      var defaults = ['#', '@', ',', '!', '?', '{', '}'];
+
+      return this._map[this._active].cancel || defaults;
     },
 
     _getTerminators: function() {
@@ -498,8 +500,6 @@
         this._cursorHead,
         this._cursorTail);
 
-      this._value = text;
-
       var pixels = JX.TextAreaUtils.getPixelDimensions(
         area,
         range.start,
@@ -517,6 +517,24 @@
 
       var trim = this._trim(text);
 
+      // If this rule has a prefix pattern, like the "[[ document ]]" rule,
+      // require it match and throw it away before we begin suggesting
+      // results. The autocomplete remains active, it's just dormant until
+      // the user gives us more to work with.
+      var prefix = this._map[this._active].prefix;
+      if (prefix) {
+        var pattern = new RegExp(prefix);
+        if (!trim.match(pattern)) {
+          return;
+        }
+        trim = trim.replace(pattern, '');
+        trim = trim.trim();
+      }
+
+      // Store the current value now that we've finished mutating the text.
+      // This needs to match what we pass to the typeahead datasource.
+      this._value = trim;
+
       // Deactivate immediately if a user types a character that we are
       // reasonably sure means they don't want to use the autocomplete. For
       // example, "##" is almost certainly a header or monospaced text, not