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+# `fact` kernel support
+
+At its current stage, `fact` uses features in the kernel that are quite
+new in order to make development easier and faster at the cost of some
+diminished compatibility. At a bare minimum, the kernel `fact` runs on
+needs:
+- Access to [BTF symbols](https://docs.ebpf.io/concepts/btf/) for
+  relocation.
+- BPF support for [LSM hooks](https://docs.ebpf.io/linux/program-type/BPF_PROG_TYPE_LSM/),
+  which might need to be enabled at boot time.
+- Support for [BPF trampolines](https://docs.ebpf.io/linux/concepts/trampolines/),
+  since this is how LSM hooks are attached.
+- Support for some newer BPF helpers and features like `bpf_loop`,
+  `BPF_MAP_TYPE_RINGBUF`, etc.
+
+Nailing down a specific list of kernels `fact` supports at this time is
+difficult, but the following distributions are actively tested against
+and expected to work on:
+
+| Distro Name | Versions | Architecture |
+|---|---|---|
+| Fedora CoreOS | 43 | amd64, arm64 |
+| RHCOS | 4.16+ | amd64 |
+| RHEL | 9.6+, 10.0+ | amd64 |
+| RHEL | 10.0+ | arm64 |