spec: table of git tags to older versions

diff --git a/SPEC.md b/SPEC.md
index cc47642..447c197 100644 (file)
--- a/SPEC.md
+++ b/SPEC.md
@@ -5,6 +5,19 @@ This is CNI **spec** version **0.3.1**.
 
 Note that this is **independent from the version of the CNI library and plugins** in this repository (e.g. the versions of [releases](https://github.com/containernetworking/cni/releases)).
 
+#### Older versions
+Older versions of the spec are available as Git tags.
+
+| tag                                                                                  | spec permalink                                                                        | major changes                     |
+| ------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------- | --------------------------------- |
+| [`spec-v0.3.1`](https://github.com/containernetworking/cni/releases/tag/spec-v0.3.1) | [spec at v0.3.1](https://github.com/containernetworking/cni/blob/spec-v0.3.1/SPEC.md) | none (typo fix only)              |
+| [`spec-v0.3.0`](https://github.com/containernetworking/cni/releases/tag/spec-v0.3.0) | [spec at v0.3.0](https://github.com/containernetworking/cni/blob/spec-v0.3.0/SPEC.md) | rich result type, plugin chaining |
+| [`spec-v0.2.0`](https://github.com/containernetworking/cni/releases/tag/spec-v0.2.0) | [spec at v0.2.0](https://github.com/containernetworking/cni/blob/spec-v0.2.0/SPEC.md) | VERSION command                   |
+| [`spec-v0.1.0`](https://github.com/containernetworking/cni/releases/tag/spec-v0.1.0) | [spec at v0.1.0](https://github.com/containernetworking/cni/blob/spec-v0.1.0/SPEC.md) | initial version                   |
+
+*Do not rely on these tags being stable.  In the future, we may change our mind about which particular commit is the right marker for a given historical spec version.*
+
+
 ## Overview
 
 This document proposes a generic plugin-based networking solution for application containers on Linux, the _Container Networking Interface_, or _CNI_.