diff --git a/src/ldap.js b/src/ldap.js
index 8098a13a3..426f0fed1 100644
--- a/src/ldap.js
+++ b/src/ldap.js
@@ -284,7 +284,7 @@ function mailboxSearch(req, res, next) {
                 res.end();
             }
         });
-    } else if (req.dn.rdns[0].attrs.domain) {
+    } else if (req.dn.rdns[0].attrs.domain) { // legacy ldap mailbox search for old sogo
         var domain = req.dn.rdns[0].attrs.domain.value.toLowerCase();
 
         mailboxdb.listMailboxes(domain, 1, 1000, function (error, result) {
@@ -318,7 +318,7 @@ function mailboxSearch(req, res, next) {
 
             finalSend(results, req, res, next);
         });
-    } else {
+    } else { // new sogo
         mailboxdb.listAllMailboxes(1, 1000, function (error, mailboxes) {
             if (error) return next(new ldap.OperationsError(error.toString()));