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+- AGBSUM
+
+AGB image header checksum patcher.
+
+- ABOUT
+
+Patches the image header checksum of an AGB image.
+
+The checksum is located at the offset 0xBD. See USAGE for more information.
+
+- USAGE
+
+agbsum [options] <image>
+
+Options:
+    --help -h    Print the help screen
+    -p           Patch the image file
+    -s           Don't print results
+    --version    Print the version number
+
+- COPYRIGHT & LICENSE
+
+Copyright 2022-2023 Gabriel Jensen.
+
+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 <https://www.gnu.org/licenses/>.