diff --git a/vars/terragruntPipeline.groovy b/vars/terragruntPipeline.groovy
index c97b2e8e..1ce5fa19 100644
--- a/vars/terragruntPipeline.groovy
+++ b/vars/terragruntPipeline.groovy
@@ -88,7 +88,9 @@ def call (Map args = [
       TERRAFORM_DIR = "$args.dir"
       TERRAFORM_VERSION = "$version"
       // https://developer.hashicorp.com/terraform/cli/config/environment-variables#tf_input
+      // run non-interactively - don't prompt for any inputs
       TF_INPUT = "false"
+      // don't output next command suggestions
       TF_IN_AUTOMATION = 1
       TERRAGRUNT_NON_INTERACTIVE = "true"
       // force the pipeline to fail if the hcl is not properly formatted