diff --git a/roles/unbound/README.md b/roles/unbound/README.md
index 6043e749..0c2ad8f1 100644
--- a/roles/unbound/README.md
+++ b/roles/unbound/README.md
@@ -23,4 +23,6 @@ The following variables can be used to customize this role:
   Defaults to `true`.
 - `unbound_thread_count`: The number of threads unbound uses.
   Defaults to max vCPU Count.
+- `unbound_private_domain`: List of domains from witch unbound for the domain and its subdomains to allows resolving of RFC1918 addresses. (Not relevent on Debian)
+  Defaults to `[]`