diff --git a/keyboards/truestrike42/config.h b/keyboards/truestrike42/config.h
index fa59ed6b85c..7b88ab0e254 100644
--- a/keyboards/truestrike42/config.h
+++ b/keyboards/truestrike42/config.h
@@ -1,3 +1,19 @@
+/* Copyright 2024 byungyoonc
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #pragma once
 
 #define MATRIX_ROWS 4
diff --git a/keyboards/truestrike42/graphics/display.h b/keyboards/truestrike42/graphics/display.h
index fd73eeda506..f6221880cd5 100644
--- a/keyboards/truestrike42/graphics/display.h
+++ b/keyboards/truestrike42/graphics/display.h
@@ -1,3 +1,6 @@
+// Copyright 2023 Dasky (@daskygit), 2024 Choi Byungyoon (@byungyoonc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
 #pragma once
 #include <stdbool.h>
 
diff --git a/keyboards/truestrike42/keymaps/default/keymap.c b/keyboards/truestrike42/keymaps/default/keymap.c
index 30d7902166e..9c80dcadd99 100644
--- a/keyboards/truestrike42/keymaps/default/keymap.c
+++ b/keyboards/truestrike42/keymaps/default/keymap.c
@@ -1,4 +1,4 @@
-// Copyright 2023 QMK
+// Copyright 2025 byungyoonc
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include QMK_KEYBOARD_H
diff --git a/keyboards/truestrike42/readme.md b/keyboards/truestrike42/readme.md
index 57fe0ce9ac9..3d101ecf566 100644
--- a/keyboards/truestrike42/readme.md
+++ b/keyboards/truestrike42/readme.md
@@ -4,7 +4,8 @@
 
 TrueStrike42 is a columnar staggered unibody split Hall effect keyboard designed to maximize performance and minimize finger fatigue.
 
-Hall effect part of this firmware code is a modified version of Cipulot's code.
+Hall effect part of this firmware code is a derivative work of Cipulot's code.
+OLED display part of this firmware code is a derivative work of Dasky's code.
 
 * Keyboard Maintainer: [byungyoonc](https://github.com/byungyoonc)
 * Hardware Supported: RP2040 development boards with Pro Micro pin layout