diff --git a/ch05/01_main-chapter-code/gpt_download.py b/ch05/01_main-chapter-code/gpt_download.py
index 91a49d4..25d6bd1 100644
--- a/ch05/01_main-chapter-code/gpt_download.py
+++ b/ch05/01_main-chapter-code/gpt_download.py
@@ -1,3 +1,10 @@
+<<<<<<< HEAD
+=======
+# Copyright (c) Sebastian Raschka under Apache License 2.0 (see LICENSE.txt).
+# Source for "Build a Large Language Model From Scratch"
+#   - https://www.manning.com/books/build-a-large-language-model-from-scratch
+# Code: https://github.com/rasbt/LLMs-from-scratch
+>>>>>>> 12cdebb (file header)
 
 
 import os
diff --git a/ch05/01_main-chapter-code/previous_chapters.py b/ch05/01_main-chapter-code/previous_chapters.py
index 4f2a032..36af5c7 100644
--- a/ch05/01_main-chapter-code/previous_chapters.py
+++ b/ch05/01_main-chapter-code/previous_chapters.py
@@ -1,5 +1,10 @@
+# Copyright (c) Sebastian Raschka under Apache License 2.0 (see LICENSE.txt).
+# Source for "Build a Large Language Model From Scratch"
+#   - https://www.manning.com/books/build-a-large-language-model-from-scratch
+# Code: https://github.com/rasbt/LLMs-from-scratch
+#
 # This file collects all the relevant code that we covered thus far
-# throughout Chapters 2-4.
+# throughout Chapters 2-5.
 # This file can be run as a standalone script.
 
 import tiktoken
diff --git a/ch05/02_alternative_weight_loading/previous_chapters.py b/ch05/02_alternative_weight_loading/previous_chapters.py
index c6be73f..972ede8 100644
--- a/ch05/02_alternative_weight_loading/previous_chapters.py
+++ b/ch05/02_alternative_weight_loading/previous_chapters.py
@@ -1,5 +1,10 @@
+# Copyright (c) Sebastian Raschka under Apache License 2.0 (see LICENSE.txt).
+# Source for "Build a Large Language Model From Scratch"
+#   - https://www.manning.com/books/build-a-large-language-model-from-scratch
+# Code: https://github.com/rasbt/LLMs-from-scratch
+#
 # This file collects all the relevant code that we covered thus far
-# throughout Chapters 2-4.
+# throughout Chapters 2-5.
 # This file can be run as a standalone script.
 
 import tiktoken
diff --git a/ch05/03_bonus_pretraining_on_gutenberg/previous_chapters.py b/ch05/03_bonus_pretraining_on_gutenberg/previous_chapters.py
index a5ded8e..3172f24 100644
--- a/ch05/03_bonus_pretraining_on_gutenberg/previous_chapters.py
+++ b/ch05/03_bonus_pretraining_on_gutenberg/previous_chapters.py
@@ -4,7 +4,7 @@
 # Code: https://github.com/rasbt/LLMs-from-scratch
 
 # This file collects all the relevant code that we covered thus far
-# throughout Chapters 2-4.
+# throughout Chapters 2-5.
 # This file can be run as a standalone script.
 
 import tiktoken