diff --git a/ls-bus-guide/0___preamble.adoc b/ls-bus-guide/0___preamble.adoc
index f638d70..66c5f81 100644
--- a/ls-bus-guide/0___preamble.adoc
+++ b/ls-bus-guide/0___preamble.adoc
@@ -6,7 +6,7 @@ https://github.com/modelica/fmi-guides/releases[Releases] and https://github.com
 {empty} +
 {empty}
 
-Copyright (C) 2021-2025 The Modelica Association Project FMI.
+Copyright (C) 2023-2025 The Modelica Association Project FMI.
 
 This document is licensed under the Attribution-ShareAlike 4.0 International license.
 The code is released under the 2-Clause BSD License.