diff --git a/README.md b/README.md
index a321f0f..e60c6ce 100644
--- a/README.md
+++ b/README.md
@@ -127,7 +127,6 @@ Container images are configured using parameters passed at runtime (such as thos
 | `-e TZ=Europe/London` | Specify a timezone to use EG Europe/London |
 | `-e PASSWORD=password` | Optional web gui password, if not provided, there will be no auth. |
 | `-e SUDO_PASSWORD=password` | If this optional variable is set, user will have sudo access in the code-server terminal with the specified password. |
-| `-e PROXY_DOMAIN=code-server.my.domain` | If this optional variable is set, this domain will be proxied for subdomain proxying. See [Documentation](https://github.com/cdr/code-server/blob/master/doc/FAQ.md#sub-domains) |
 | `-v /config` | Contains all relevant configuration files. |
 
 ## Environment variables from files (Docker secrets)
diff --git a/readme-vars.yml b/readme-vars.yml
index 9df9c18..f9649bf 100644
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -49,6 +49,7 @@ opt_param_usage_include_env: true
 opt_param_env_vars:
   - { env_var: "PASSWORD", env_value: "password", desc: "Optional web gui password, if not provided, there will be no auth."}
   - { env_var: "SUDO_PASSWORD", env_value: "password", desc: "If this optional variable is set, user will have sudo access in the code-server terminal with the specified password."}
+  - { env_var: "PROXY_DOMAIN", env_value: "code-server.my.domain", desc: "If this optional variable is set, this domain will be proxied for subdomain proxying. See [Documentation](https://github.com/cdr/code-server/blob/master/doc/FAQ.md#sub-domains)" }
 
 optional_block_1: false
 optional_block_1_items: ""