diff --git a/builtin/providers/aws/resource_aws_ecs_service.go b/builtin/providers/aws/resource_aws_ecs_service.go
index b541e7665..eee8ddf06 100644
--- a/builtin/providers/aws/resource_aws_ecs_service.go
+++ b/builtin/providers/aws/resource_aws_ecs_service.go
@@ -511,6 +511,8 @@ func resourceAwsEcsLoadBalancerHash(v interface{}) int {
 	var buf bytes.Buffer
 	m := v.(map[string]interface{})
 
+	// There are 2 types of load balancers: ELB/ALB
+	// In case of ELB `elb_name` is expected and for ALB `target_group_arn` is.
 	optionalLoadBalancerParams := []string{"target_group_arn", "elb_name"}
 
 	for i := range optionalLoadBalancerParams {