diff --git a/src/applications/search/ferret/PhabricatorFerretEngine.php b/src/applications/search/ferret/PhabricatorFerretEngine.php
index 3f36893b40..252223548a 100644
--- a/src/applications/search/ferret/PhabricatorFerretEngine.php
+++ b/src/applications/search/ferret/PhabricatorFerretEngine.php
@@ -1,245 +1,247 @@
 <?php
 
 abstract class PhabricatorFerretEngine extends Phobject {
 
   private $fieldMap = array();
   private $ferretFunctions;
   private $templateObject;
 
   abstract public function getApplicationName();
   abstract public function getScopeName();
   abstract public function newSearchEngine();
 
   public function getDefaultFunctionKey() {
     return 'all';
   }
 
   public function getObjectTypeRelevance() {
     return 1000;
   }
 
   final public function getFunctionForName($raw_name) {
     if (isset($this->fieldMap[$raw_name])) {
       return $this->fieldMap[$raw_name];
     }
 
     $normalized_name =
       FerretSearchFunction::getNormalizedFunctionName($raw_name);
 
     if ($this->ferretFunctions === null) {
       $functions = FerretSearchFunction::newFerretSearchFunctions();
       $this->ferretFunctions = $functions;
     }
 
     if (!isset($this->ferretFunctions[$normalized_name])) {
       throw new PhutilSearchQueryCompilerSyntaxException(
         pht(
-          'Unknown search function "%s". Supported functions are: %s.',
+          'Unknown search function "%s". Supported functions are: %s. '.
+          '(To search for a term containing a colon, surround the term '.
+          'in double quotes.)',
           $raw_name,
           implode(', ', array_keys($this->ferretFunctions))));
     }
 
     $function = $this->ferretFunctions[$normalized_name];
     $this->fieldMap[$raw_name] = $function;
 
     return $this->fieldMap[$raw_name];
   }
 
   public function newStemmer() {
     return new PhutilSearchStemmer();
   }
 
   public function newTermsCorpus($raw_corpus) {
     $term_corpus = strtr(
       $raw_corpus,
       array(
         '!' => ' ',
         '"' => ' ',
         '#' => ' ',
         '$' => ' ',
         '%' => ' ',
         '&' => ' ',
         '(' => ' ',
         ')' => ' ',
         '*' => ' ',
         '+' => ' ',
         ',' => ' ',
         '-' => ' ',
         '/' => ' ',
         ':' => ' ',
         ';' => ' ',
         '<' => ' ',
         '=' => ' ',
         '>' => ' ',
         '?' => ' ',
         '@' => ' ',
         '[' => ' ',
         '\\' => ' ',
         ']' => ' ',
         '^' => ' ',
         '`' => ' ',
         '{' => ' ',
         '|' => ' ',
         '}' => ' ',
         '~' => ' ',
         '.' => ' ',
         '_' => ' ',
         "\n" => ' ',
         "\r" => ' ',
         "\t" => ' ',
       ));
 
     // NOTE: Single quotes divide terms only if they're at a word boundary.
     // In contractions, like "whom'st've", the entire word is a single term.
     $term_corpus = preg_replace('/(^| )[\']+/', ' ', $term_corpus);
     $term_corpus = preg_replace('/[\']+( |$)/', ' ', $term_corpus);
 
     $term_corpus = preg_replace('/\s+/u', ' ', $term_corpus);
     $term_corpus = trim($term_corpus, ' ');
 
     if (strlen($term_corpus)) {
       $term_corpus = ' '.$term_corpus.' ';
     }
 
     return $term_corpus;
   }
 
 /* -(  Schema  )------------------------------------------------------------- */
 
   public function getDocumentTableName() {
     $application = $this->getApplicationName();
     $scope = $this->getScopeName();
 
     return "{$application}_{$scope}_fdocument";
   }
 
   public function getDocumentSchemaColumns() {
     return array(
       'id' => 'auto',
       'objectPHID' => 'phid',
       'isClosed' => 'bool',
       'authorPHID' => 'phid?',
       'ownerPHID' => 'phid?',
       'epochCreated' => 'epoch',
       'epochModified' => 'epoch',
     );
   }
 
   public function getDocumentSchemaKeys() {
     return array(
       'PRIMARY' => array(
         'columns' => array('id'),
         'unique' => true,
       ),
       'key_object' => array(
         'columns' => array('objectPHID'),
         'unique' => true,
       ),
       'key_author' => array(
         'columns' => array('authorPHID'),
       ),
       'key_owner' => array(
         'columns' => array('ownerPHID'),
       ),
       'key_created' => array(
         'columns' => array('epochCreated'),
       ),
       'key_modified' => array(
         'columns' => array('epochModified'),
       ),
     );
   }
 
   public function getFieldTableName() {
     $application = $this->getApplicationName();
     $scope = $this->getScopeName();
 
     return "{$application}_{$scope}_ffield";
   }
 
   public function getFieldSchemaColumns() {
     return array(
       'id' => 'auto',
       'documentID' => 'uint32',
       'fieldKey' => 'text4',
       'rawCorpus' => 'sort',
       'termCorpus' => 'sort',
       'normalCorpus' => 'sort',
     );
   }
 
   public function getFieldSchemaKeys() {
     return array(
       'PRIMARY' => array(
         'columns' => array('id'),
         'unique' => true,
       ),
       'key_documentfield' => array(
         'columns' => array('documentID', 'fieldKey'),
         'unique' => true,
       ),
     );
   }
 
   public function getNgramsTableName() {
     $application = $this->getApplicationName();
     $scope = $this->getScopeName();
 
     return "{$application}_{$scope}_fngrams";
   }
 
   public function getNgramsSchemaColumns() {
     return array(
       'id' => 'auto',
       'documentID' => 'uint32',
       'ngram' => 'char3',
     );
   }
 
   public function getNgramsSchemaKeys() {
     return array(
       'PRIMARY' => array(
         'columns' => array('id'),
         'unique' => true,
       ),
       'key_ngram' => array(
         'columns' => array('ngram', 'documentID'),
       ),
       'key_object' => array(
         'columns' => array('documentID'),
       ),
     );
   }
 
   public function getCommonNgramsTableName() {
     $application = $this->getApplicationName();
     $scope = $this->getScopeName();
 
     return "{$application}_{$scope}_fngrams_common";
   }
 
   public function getCommonNgramsSchemaColumns() {
     return array(
       'id' => 'auto',
       'ngram' => 'char3',
       'needsCollection' => 'bool',
     );
   }
 
   public function getCommonNgramsSchemaKeys() {
     return array(
       'PRIMARY' => array(
         'columns' => array('id'),
         'unique' => true,
       ),
       'key_ngram' => array(
         'columns' => array('ngram'),
         'unique' => true,
       ),
       'key_collect' => array(
         'columns' => array('needsCollection'),
       ),
     );
   }
 
 }