diff --git a/README.md b/README.md
index 2d44399..ab28fb2 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,4 @@
 
 [![Build Status](https://travis-ci.com/telia-oss/terraform-aws-lambda.svg?branch=master)](https://travis-ci.com/telia-oss/terraform-aws-lambda)
 
-This module creates a lambda function and takes care of setting up the execution role, in addition to uploading the source code.
+This module creates a lambda function and takes care of setting up the execution role, in addition to uploading the source code. When using `s3_key` and `s3_bucket` the `source_code_hash` _must_ be manually set if you wish to trigger updates.
diff --git a/outputs.tf b/outputs.tf
index ad4326d..1192342 100644
--- a/outputs.tf
+++ b/outputs.tf
@@ -3,7 +3,7 @@
 # ------------------------------------------------------------------------------
 output "arn" {
   description = "The Amazon Resource Name (ARN) identifying your Lambda Function."
-  value       = "${element(concat(aws_lambda_function.main.*.arn, aws_lambda_function.vpc.*.arn, aws_lambda_function.main_s3.*.arn, aws_lambda_function.vpc_s3.*.arn,), 0)}"
+  value       = "${element(concat(aws_lambda_function.main.*.arn, aws_lambda_function.vpc.*.arn, aws_lambda_function.main_s3.*.arn, aws_lambda_function.vpc_s3.*.arn, list("")), 0)}"
 }
 
 output "name" {
@@ -28,10 +28,10 @@ output "security_group_id" {
 
 output "invoke_arn" {
   description = " The ARN to be used for invoking Lambda Function from API Gateway - to be used in aws_api_gateway_integration uri."
-  value       = "${element(concat(aws_lambda_function.main.*.invoke_arn, aws_lambda_function.vpc.*.invoke_arn, aws_lambda_function.main_s3.*.invoke_arn, aws_lambda_function.vpc_s3.*.invoke_arn,), 0)}"
+  value       = "${element(concat(aws_lambda_function.main.*.invoke_arn, aws_lambda_function.vpc.*.invoke_arn, aws_lambda_function.main_s3.*.invoke_arn, aws_lambda_function.vpc_s3.*.invoke_arn, list("")), 0)}"
 }
 
 output "qualified_arn" {
   description = " The Amazon Resource Name (ARN) identifying your Lambda Function Version (if versioning is enabled via publish = true)."
-  value       = "${element(concat(aws_lambda_function.main.*.qualified_arn, aws_lambda_function.vpc.*.qualified_arn, aws_lambda_function.main_s3.*.qualified_arn, aws_lambda_function.vpc_s3.*.qualified_arn,), 0)}"
+  value       = "${element(concat(aws_lambda_function.main.*.qualified_arn, aws_lambda_function.vpc.*.qualified_arn, aws_lambda_function.main_s3.*.qualified_arn, aws_lambda_function.vpc_s3.*.qualified_arn, list("")), 0)}"
 }