diff --git a/inc/inc.ClassSettings.php b/inc/inc.ClassSettings.php
index e2cac868d..604df1eea 100644
--- a/inc/inc.ClassSettings.php
+++ b/inc/inc.ClassSettings.php
@@ -221,14 +221,24 @@ class Settings { /* {{{ */
 	var $_smtpPort = null;
 	// SMTP : send from
 	var $_smtpSendFrom = null;
-	// LDAP
-	var $_ldapHost = ""; // URIs are supported, e.g.: ldaps://ldap.host.com
-	var $_ldapPort = 389; // Optional.
+	// LDAP Host, URIs are supported, e.g.: ldaps://ldap.host.com
+	var $_ldapHost = "";
+	// Port of ldap server, optional.
+	var $_ldapPort = 389;
+	// Base dn for searching users, if set the user will be search below base dn
 	var $_ldapBaseDN = "";
+	// Use this dn for an initial bind for searching the user
 	var $_ldapBindDN = "";
+	// Use this password for an initial bind for searching the user
 	var $_ldapBindPw = "";
+	// Used only by AD <username>@_ldapAccountDomainName will be used for a bind
+	// when the user is validated
 	var $_ldapAccountDomainName = "";
-	var $_ldapType = 1; // 0 = ldap; 1 = AD
+	// Type of Ldap server: 0 = ldap; 1 = AD
+	var $_ldapType = 1;
+	// Additional filter when searching for the user. If not set, the user will be searched
+	// below basedn and the search term 'uid=<username>' or 'sAMAccountName=<username>'
+	// if set the search will be (&(cn=<username>)<filter>)
 	var $_ldapFilter = "";
 	var $_converters = array(); // list of commands used to convert files to text for Indexer