diff --git a/modules/mysql-db/variables.tf b/modules/mysql-db/variables.tf
index 57758f6..a6518f8 100644
--- a/modules/mysql-db/variables.tf
+++ b/modules/mysql-db/variables.tf
@@ -29,6 +29,7 @@ variable "mysql_name" {
   description = "Name of the MySQL"
 }
 
+# sometimes the zone is not available, just destroy the resource and change the zone
 variable "mysql_zone" {
   type        = number
   description = "Zone where to deploy, can be 1,2 or 3"