Note an exception to the platform.os recommendation for wasi

Signed-off-by: Jason Hall <jason@chainguard.dev>
opencontainers · Oct 13, 2022 · 265874e · 265874e
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diff --git a/image-index.md b/image-index.md
@@ -59,6 +59,7 @@ For the media type(s) that this document is compatible with, see the [matrix][ma
 
         This REQUIRED property specifies the operating system.
         Image indexes SHOULD use, and implementations SHOULD understand, values listed in the Go Language document for [`GOOS`][go-environment2].
+        An exception to this guidance is provided for Wasm applications that rely on the WASI system interface, where the `os` SHOULD be `wasi`.
 
     - **`os.version`** *string*