diff --git a/roles/kerberos_kdc/README.md b/roles/kerberos_kdc/README.md
index 3e861fa..fe76212 100644
--- a/roles/kerberos_kdc/README.md
+++ b/roles/kerberos_kdc/README.md
@@ -5,9 +5,12 @@ Center).
 
 ## Variables
 
-| Variable | Default value | Type | Description | Required |
-| -------- | ------------- | ---- |----------- | -------- |
-
+| Variable                     | Default value                            | Type | Description                       | Required |
+| ---------------------------- | ---------------------------------------- | ---- | --------------------------------- | -------- |
+| kerberos_kdc_domain_name     |                                          | str  | Kerberos KDC domain name.         | yes      |
+| kerberos_kdc_realm           | '{{ kerberos_kdc_domain_name \| upper }}' | str  | Kerberos KDC realm.               | no       |
+| kerberos_kdc_admin_principal | 'admin@{{ kerberos_kdc_realm }}'         | str  | Kerberos administrator principal. | no       |
+| kerberos_kdc_db_password     |                                          | str  | Kerberos database password.       | yes      |
 
 ## License