diff --git a/a/README.md b/a/README.md
index c6964be..9145069 100644
--- a/a/README.md
+++ b/a/README.md
@@ -98,6 +98,15 @@ provider "aws" {
 }
 ```
 
+file: variables.username.tf
+```hcl
+variable "os_username" {
+  description = "OS username from environment variable, ideally as $USER"
+  type        = string
+  default     = null
+}
+```
+
 file: dns.tf
 ```hcl
 module "db_cname" {
diff --git a/a/main.tf b/a/main.tf
index c14cf75..d20c903 100644
--- a/a/main.tf
+++ b/a/main.tf
@@ -98,6 +98,15 @@
 *   }
 * }
 * ```
+*
+* file: variables.username.tf
+* ```hcl
+* variable "os_username" {
+*   description = "OS username from environment variable, ideally as $USER"
+*   type        = string
+*   default     = null
+* }
+* ```
 * 
 * file: dns.tf
 * ```hcl
diff --git a/aaaa/README.md b/aaaa/README.md
index 29bcc56..e998475 100644
--- a/aaaa/README.md
+++ b/aaaa/README.md
@@ -96,6 +96,15 @@ provider "aws" {
 }
 ```
 
+file: variables.username.tf
+```hcl
+variable "os_username" {
+  description = "OS username from environment variable, ideally as $USER"
+  type        = string
+  default     = null
+}
+```
+
 file: dns.tf
 ```hcl
 module "db_cname" {
diff --git a/aaaa/main.tf b/aaaa/main.tf
index ecaf2cd..9a11ef6 100644
--- a/aaaa/main.tf
+++ b/aaaa/main.tf
@@ -96,6 +96,15 @@
 *   }
 * }
 * ```
+*
+* file: variables.username.tf
+* ```hcl
+* variable "os_username" {
+*   description = "OS username from environment variable, ideally as $USER"
+*   type        = string
+*   default     = null
+* }
+* ```
 * 
 * file: dns.tf
 * ```hcl
diff --git a/cname/README.md b/cname/README.md
index 703b1b0..4cbf6d5 100644
--- a/cname/README.md
+++ b/cname/README.md
@@ -98,6 +98,15 @@ provider "aws" {
 }
 ```
 
+file: variables.username.tf
+```hcl
+variable "os_username" {
+  description = "OS username from environment variable, ideally as $USER"
+  type        = string
+  default     = null
+}
+```
+
 file: dns.tf
 ```hcl
 module "db_cname" {
diff --git a/cname/main.tf b/cname/main.tf
index 5818139..3a3cc9f 100644
--- a/cname/main.tf
+++ b/cname/main.tf
@@ -98,6 +98,15 @@
 *   }
 * }
 * ```
+*
+* file: variables.username.tf
+* ```hcl
+* variable "os_username" {
+*   description = "OS username from environment variable, ideally as $USER"
+*   type        = string
+*   default     = null
+* }
+* ```
 * 
 * file: dns.tf
 * ```hcl
diff --git a/host/README.md b/host/README.md
index 3d157e8..c38b9e4 100644
--- a/host/README.md
+++ b/host/README.md
@@ -95,6 +95,15 @@ provider "aws" {
 }
 ```
 
+file: variables.username.tf
+```hcl
+variable "os_username" {
+  description = "OS username from environment variable, ideally as $USER"
+  type        = string
+  default     = null
+}
+```
+
 file: dns.tf
 ```hcl
 module "db_cname" {
diff --git a/host/main.tf b/host/main.tf
index 04aad66..ed2edd7 100644
--- a/host/main.tf
+++ b/host/main.tf
@@ -95,6 +95,15 @@
 *   }
 * }
 * ```
+*
+* file: variables.username.tf
+* ```hcl
+* variable "os_username" {
+*   description = "OS username from environment variable, ideally as $USER"
+*   type        = string
+*   default     = null
+* }
+* ```
 * 
 * file: dns.tf
 * ```hcl
diff --git a/ptr/README.md b/ptr/README.md
index d1677cd..28edc97 100644
--- a/ptr/README.md
+++ b/ptr/README.md
@@ -92,6 +92,15 @@ provider "aws" {
 }
 ```
 
+file: variables.username.tf
+```hcl
+variable "os_username" {
+  description = "OS username from environment variable, ideally as $USER"
+  type        = string
+  default     = null
+}
+```
+
 file: dns.tf
 ```hcl
 module "db_cname" {
diff --git a/ptr/main.tf b/ptr/main.tf
index cccda4b..5244be5 100644
--- a/ptr/main.tf
+++ b/ptr/main.tf
@@ -92,6 +92,15 @@
 *   }
 * }
 * ```
+*
+* file: variables.username.tf
+* ```hcl
+* variable "os_username" {
+*   description = "OS username from environment variable, ideally as $USER"
+*   type        = string
+*   default     = null
+* }
+* ```
 * 
 * file: dns.tf
 * ```hcl