diff --git a/iam.tf b/iam.tf
index 57904eb..469656f 100644
--- a/iam.tf
+++ b/iam.tf
@@ -76,7 +76,7 @@ resource "azurerm_role_assignment" "castai_node_resource_group" {
 resource "azurerm_role_assignment" "castai_additional_resource_groups" {
   for_each           = toset(var.additional_resource_groups)
   principal_id       = azuread_service_principal.castai.id
-  description        = "castai role assignment for resource group ${var.additional_resource_groups}"
+  description        = "castai role assignment for resource group ${each.key}"
   role_definition_id = azurerm_role_definition.castai.role_definition_resource_id
   scope              = each.key
 }