diff --git a/h2inc.py b/h2inc.py
index f58119e..13372b1 100644
--- a/h2inc.py
+++ b/h2inc.py
@@ -1,5 +1,9 @@
-# (c)2018 Jan Lerking
-# Convert a C-header file to an asm include file
+# You are free to use and/or change this code for
+# your own needs.
+
+# Original code (c)2018 Jan Lerking
+# Program to convert C-header (*.h) files to nasm include files (*.inc),
+# for direct usage in assembly programming using nasm/yasm.
 
 import os
 import sys
diff --git a/h2inc_gui.py b/h2inc_gui.py
index b8f0e76..2c438a3 100644
--- a/h2inc_gui.py
+++ b/h2inc_gui.py
@@ -1,3 +1,10 @@
+# You are free to use and/or change this code for
+# your own needs.
+
+# Original code (c)2018 Jan Lerking
+# Program to convert C-header (*.h) files to nasm include files (*.inc),
+# for direct usage in assembly programming using nasm/yasm.
+
 from tkinter import Tk, ttk, Label, Button, LabelFrame
 from tkinter import filedialog, Entry, Checkbutton
 from tkinter import Grid, StringVar
diff --git a/h2inc_parser.py b/h2inc_parser.py
index 3061c24..7cca453 100644
--- a/h2inc_parser.py
+++ b/h2inc_parser.py
@@ -1,5 +1,9 @@
-# (c)2018 Jan Lerking
-# Convert a C-header file to an asm include file
+# You are free to use and/or change this code for
+# your own needs.
+
+# Original code (c)2018 Jan Lerking
+# Program to convert C-header (*.h) files to nasm include files (*.inc),
+# for direct usage in assembly programming using nasm/yasm.
 
 import sys
 import string