diff --git a/README.md b/README.md
index 44a6627..87b7d37 100644
--- a/README.md
+++ b/README.md
@@ -12,11 +12,15 @@ To build a butter image, run:
 vmdb2 --rootfs-tarball=my_image.tar.gz --output my_image.img --log my_image.log
 ```
 
+## Advanced Documentation
+
+* [Creating an upgrade content pack for the Butter Box](./docs/upgrade_pack.md)
+
 ## Copyright and Licence
 
 &copy; 2017, Michael Stapelberg and contributors<br>
-&copy; 2021 guardianproject<br>
-&copy; SR2 Communications Limited
+&copy; 2021, guardianproject<br>
+&copy; 2025-2026, SR2 Communications Limited
 
 See [LICENCE](./LICENCE) for details of the BSD-3 clause licence.
 
diff --git a/debian.md b/docs/upgrade_pack.md
similarity index 100%
rename from debian.md
rename to docs/upgrade_pack.md