diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2bf8391be..ca0c023ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Change log
 
+- [#412](https://github.com/mobilityhouse/ocpp/issues/412) Add default value to 1.6 AuthorizationData datatype, id_tag_info
+- [#141](https://github.com/mobilityhouse/ocpp/issues/141) Add to docs OCPP 1.6 Security White Paper Ed 2
+
 ## 0.20.0 (2023-10-10) 
 
 - [#471](https://github.com/mobilityhouse/ocpp/issues/471) Fix `ImportError` when using jsonschema 4.19.0 or higher.
diff --git a/ocpp/v16/datatypes.py b/ocpp/v16/datatypes.py
index 8d2fe1efe..1f249e477 100644
--- a/ocpp/v16/datatypes.py
+++ b/ocpp/v16/datatypes.py
@@ -38,7 +38,7 @@ class AuthorizationData:
     """
 
     id_tag: str
-    id_tag_info: Optional[IdTagInfo]
+    id_tag_info: Optional[IdTagInfo] = None
 
 
 @dataclass