diff --git a/doc/architecture/Domain.md b/doc/architecture/Domain.md
index c6d6da6..7e2787e 100644
--- a/doc/architecture/Domain.md
+++ b/doc/architecture/Domain.md
@@ -55,6 +55,10 @@ classDiagram
         do_spaces_access_key
         do_spaces_secret_key
     }
+
+    class Hetzner {
+        hetzner_api_key
+    }
     
     class DnsRecord {
         fqdn
@@ -104,7 +108,8 @@ classDiagram
     Devops *-- "0..1" ProvsK3s: specialized_builds
     Devops *-- "0..1" TerraformDomain: specialized_builds
     Devops *-- "0..1" Release: mixins
-    TerraformDomain *-- "0..1" Digitalocean: provider
+    TerraformDomain *-- "0..1" Digitalocean: providers
+    TerraformDomain *-- "0..1" Hetzner: providers
     Release o-- "0..1" BuildFile: primary_build_file
     Release o-- "0..n" BuildFile: secondary_build_files
     BuildFile *-- "1" Version