diff --git a/todo.txt b/todo.txt
index 1709e02a..9eb92171 100644
--- a/todo.txt
+++ b/todo.txt
@@ -30,6 +30,7 @@ Rank, Tree structure
 
 MySQL:
 Data longer than max_allowed_packet can be sent by mysqli_stmt_send_long_data()
+Check constraints: https://github.com/vrana/adminer/pull/458
 
 MariaDB:
 Documentation links