diff --git a/src/include/DSP_lib.h b/src/include/DSP_lib.h
index 064ec205dd8b31fcd481069d2ebd5bd7069cfde4..4c7c2d8eb3f200abde93ede2e5d06cb79ecdd6b1 100644
--- a/src/include/DSP_lib.h
+++ b/src/include/DSP_lib.h
@@ -167,9 +167,9 @@ string DSP::lib_version_string();
 
 /*! \mainpage Digital Signal Processing Engine Documentation
  *
- *  <b>Digital Signal Processing Engine</b> 2005-2021
+ *  <b>Digital Signal Processing Engine</b> 2005-2023
  *
- *  This project is licensed under GNU Lesser General Public License v2.1. 
+ *  This project is licensed under GNU Lesser General Public License ver. 3
  *  \ref lib_license
  *
  * \section lib_lic_author Engine author