diff --git a/inc/inc.ClassFulltextService.php b/inc/inc.ClassFulltextService.php
index 142943183..23309cf6c 100644
--- a/inc/inc.ClassFulltextService.php
+++ b/inc/inc.ClassFulltextService.php
@@ -7,17 +7,27 @@
  * @license    GPL 2
  * @version    @version@
  * @author     Uwe Steinmann <uwe@steinmann.cx>
- * @copyright  Copyright (C) 2016 Uwe Steinmann
+ * @copyright  Copyright (C) 2021-2023 Uwe Steinmann
  * @version    Release: @package_version@
  */
 
 /**
  * Implementation of fulltext service
  *
+ * The fulltext service is wrapper around single services for a full text
+ * search. Such a service can be based on Solr, SQlite, etc. It implements
+ * three major methods:
+ * IndexedDocument() for creating an instance of an indexed document
+ * Indexer() for creating an instance of the index
+ * Search() fro creating an instance of a search frontend
+ *
+ * Though this class can manage more than one service, it will only
+ * use the first one.
+ *
  * @category   DMS
  * @package    SeedDMS
  * @author     Uwe Steinmann <uwe@steinmann.cx>
- * @copyright  Copyright (C) 2016 Uwe Steinmann
+ * @copyright  Copyright (C) 2021-2023 Uwe Steinmann
  * @version    Release: @package_version@
  */
 class SeedDMS_FulltextService {
@@ -136,7 +146,7 @@ class SeedDMS_FulltextService {
 	/**
 	 * Returns callback function to convert a document into plain text
 	 *
-	 * This variant just uses the text previewer which
+	 * This variant uses the text previewer which
 	 * caches the converted document
 	 */
 	public function getConversionWithPreviewCallback() { /* {{{ */
@@ -162,7 +172,7 @@ class SeedDMS_FulltextService {
 	} /* }}} */
 
 	/**
-	 * Return an indexable document from the given document or folder
+	 * Return an indexable document based on the given document or folder
 	 *
 	 * @param SeedDMS_Core_Document|SeedDMS_Core_Folder $object document or folder
 	 * to be indexed
@@ -183,7 +193,7 @@ class SeedDMS_FulltextService {
 	/**
 	 * Returns an instance of the indexer
 	 *
-	 * The indexer provides access to fulltext index. It allows to add and
+	 * The indexer provides access to the fulltext index. It allows to add and
 	 * get documents.
 	 *
 	 * @return object instance of class specified in 'Indexer'