diff --git a/src/setup.php b/src/setup.php
index 737f40a..254682b 100644
--- a/src/setup.php
+++ b/src/setup.php
@@ -266,6 +266,8 @@ function createMysqlTables(Database_Abstract $db)
     //$collation = hasMysqlUnicode520($db) ? 'utf8mb4_unicode_520_ci' : 'utf8mb4_unicode_ci';
     $collation = 'utf8mb4_unicode_520_ci';
 
+    //TODO: use BIGINT for time() timestamp to avoid the Year-2038 problem (2106 here)
+
     // Mysql does not support transactions while executing DDL
     $db->ex(
 "CREATE TABLE {$db->prefix}lists (
@@ -346,6 +348,8 @@ function createMysqlTables(Database_Abstract $db)
 /* ===== postgres =============================================== */
 function createPostgresTables(Database_Abstract $db)
 {
+    //TODO: use BIGINT for time() timestamp to avoid the Year-2038 problem
+
     $db->ex(
 "CREATE TABLE {$db->prefix}lists (
     id INTEGER NOT NULL GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,