Add more information in README

README.md

@@ -1,3 +1,23 @@
 # kernels
 
 This repository holds both infrastructure and assets for bpftrace's CI kernels.
+
+We use a [dummy release][1] as an object store.
+
+## Adding a new kernel
+
+To add a new kernel, update [KERNELS][0] with the upstream tag of the version
+you want. Examples: `v6.12`, `v6.12-rc7`.
+
+Once the change is checked in, automation build and upload any kernels not
+already present in the [Assets Release][0] to the assets release.
+
+## Changing already-built kernels
+
+Automation is not yet smart enough to rebuild and reupload older kernels
+affected by a config or infra change. If you want to change an already-uploaded
+kernel, delete the impacted kernel from the release assets and trigger a new
+run.
+
+[0]: ./KERNELS
+[1]: https://github.com/bpftrace/kernels/releases/tag/assets