diff --git a/.tfdocs-config.yml b/.terraform-docs.yml
similarity index 91%
rename from .tfdocs-config.yml
rename to .terraform-docs.yml
index b65e6731f..f3be6195b 100644
--- a/.tfdocs-config.yml
+++ b/.terraform-docs.yml
@@ -1,6 +1,6 @@
 ### To generate the output file to partially incorporate in the README.md,
 ### Execute this command in the Terraform module's code folder:
-# terraform-docs -c .tfdocs-config.yml .
+# terraform-docs -c .terraform-docs.yml .
 
 formatter: "markdown document" # this is required
 
@@ -18,7 +18,7 @@ sections:
   show: []
 
   hide-all: false # deprecated in v0.13.0, removed in v0.15.0
-  show-all: true  # deprecated in v0.13.0, removed in v0.15.0
+  show-all: true # deprecated in v0.13.0, removed in v0.15.0
 
 content: |-
   {{ .Header }}
diff --git a/Makefile b/Makefile
index 6a05c4bb0..adcfb77f3 100644
--- a/Makefile
+++ b/Makefile
@@ -72,4 +72,7 @@ opa-update-git:
 	@echo "==> Running script..."
 	./tests/scripts/opa-update-git.sh
 
-.PHONY: azp-strategy azp-backend azp-spn-generator tf-install tf-prepare tf-fmt tf-init tf-plan tf-apply tf-destroy terratest opa-install opa-run-tests opa-update-values opa-update-git
+docs:
+	terraform-docs .
+
+.PHONY: azp-strategy azp-backend azp-spn-generator docs tf-install tf-prepare tf-fmt tf-init tf-plan tf-apply tf-destroy terratest opa-install opa-run-tests opa-update-values opa-update-git
diff --git a/variables.tf b/variables.tf
index bc1b1bb3c..a406169c0 100644
--- a/variables.tf
+++ b/variables.tf
@@ -603,8 +603,8 @@ DESCRIPTION
   default     = {}
 
   validation {
-    condition     = can([for k in keys(var.custom_landing_zones) : regex("^[a-zA-Z0-9-]{2,89}$", k)]) || length(keys(var.custom_landing_zones)) == 0
-    error_message = "The custom_landing_zones keys must be between 2 to 89 characters long and can only contain lowercase letters, numbers and hyphens."
+    condition     = can([for k in keys(var.custom_landing_zones) : regex("^[a-zA-Z0-9-.]{2,89}$", k)]) || length(keys(var.custom_landing_zones)) == 0
+    error_message = "The custom_landing_zones keys must be between 2 to 89 characters long and can only contain lowercase letters, numbers, periods, and hyphens."
   }
 }