diff --git a/CHANGELOG b/CHANGELOG
index 833e33d6..87d04bdc 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,16 +1,11 @@
 
-Changes to version ?
-------------------------
-
-New features and improvements:
-
-- .NET API: added additional callbacks to control external access to the data model (required to implement RBAC)
-
 Changes to version 1.6.1
 ------------------------
 
 New features and improvements:
 
+- .NET API: SVControlBlock added
+- .NET API: Added additional callbacks to control external access to the data model (required to implement RBAC)
 - .NET API: IEC61850ServerAPI -> LogStorage function wrapper added.
 - .NET API: MmsValue -> MmsValue_encodeMmsData and MmsValue_decodeMmsData added.
 - .NET API: Fixed issue of not printing log entries in log_client and log_server examples.
diff --git a/dotnet/IEC61850forCSharp/IEC61850Model/SVControlBlock.cs b/dotnet/IEC61850forCSharp/IEC61850Model/SVControlBlock.cs
index e9c1300f..9e5423f1 100644
--- a/dotnet/IEC61850forCSharp/IEC61850Model/SVControlBlock.cs
+++ b/dotnet/IEC61850forCSharp/IEC61850Model/SVControlBlock.cs
@@ -1,4 +1,26 @@
-using IEC61850.Server;
+/*
+ *  IEC61850ServerAPI.cs
+ *
+ *  Copyright 2016-2025 Michael Zillgith
+ *
+ *  This file is part of libIEC61850.
+ *
+ *  libIEC61850 is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  libIEC61850 is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with libIEC61850.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  See COPYING file for the complete license text.
+ */
+using IEC61850.Server;
 using System;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;