diff --git a/phpBB/includes/search/fulltext_mysql.php b/phpBB/includes/search/fulltext_mysql.php
index 0cd0f99695..2084864e4d 100644
--- a/phpBB/includes/search/fulltext_mysql.php
+++ b/phpBB/includes/search/fulltext_mysql.php
@@ -59,7 +59,8 @@ class phpbb_search_fulltext_mysql extends phpbb_search_base
 	public $word_length = array();
 
 	/**
-	 * Contains tidied search query
+	 * Contains tidied search query.
+	 * Operators are prefixed in search query and common words excluded
 	 * @var string
 	 */
 	public $search_query;
diff --git a/phpBB/includes/search/fulltext_native.php b/phpBB/includes/search/fulltext_native.php
index 5aa718a6e6..14d4c60134 100644
--- a/phpBB/includes/search/fulltext_native.php
+++ b/phpBB/includes/search/fulltext_native.php
@@ -35,7 +35,8 @@ class phpbb_search_fulltext_native extends phpbb_search_base
 	public $word_length = array();
 
 	/**
-	 * Contains tidied search query
+	 * Contains tidied search query.
+	 * Operators are prefixed in search query and common words excluded
 	 * @var string
 	 */
 	public $search_query;
diff --git a/phpBB/includes/search/fulltext_postgres.php b/phpBB/includes/search/fulltext_postgres.php
index 50546edec3..98bf010c93 100644
--- a/phpBB/includes/search/fulltext_postgres.php
+++ b/phpBB/includes/search/fulltext_postgres.php
@@ -78,7 +78,8 @@ class phpbb_search_fulltext_postgres extends phpbb_search_base
 	protected $user;
 
 	/**
-	 * Contains tidied search query
+	 * Contains tidied search query.
+	 * Operators are prefixed in search query and common words excluded
 	 * @var string
 	 */
 	public $search_query;
diff --git a/phpBB/includes/search/fulltext_sphinx.php b/phpBB/includes/search/fulltext_sphinx.php
index ceb6b0a7aa..2f6be20703 100644
--- a/phpBB/includes/search/fulltext_sphinx.php
+++ b/phpBB/includes/search/fulltext_sphinx.php
@@ -114,7 +114,8 @@ class phpbb_search_fulltext_sphinx
 	protected $config_file_data = '';
 
 	/**
-	 * Contains tidied search query
+	 * Contains tidied search query.
+	 * Operators are prefixed in search query and common words excluded
 	 * @var string
 	 */
 	public $search_query;