Update spec.md

Co-authored-by: Jon Johnson <[email protected]> Signed-off-by: Josh Dolitsky <[email protected]>
opencontainers · Apr 13, 2023 · c6e8f6e · c6e8f6e
1 parent b1f810e
commit c6e8f6e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/spec.md b/spec.md
@@ -489,7 +489,7 @@ When pushing a manifest with the `subject` field and the [referrers API](#listin
 1. If the tag returns a 404, the client MUST begin with an empty image index.
 1. Verify the descriptor for the manifest is not already in the referrers list (duplicate entries SHOULD NOT be created).
 1. Append a descriptor for the pushed manifest to the manifests in the referrers list.
-   The value of the `artifactType` MUST be set to the `artifactType` value in the image manifest.
+   The value of the `artifactType` MUST be set to the `artifactType` value in the image manifest, if present.
    If the `artifactType` is empty or missing in the image manifest, the value of `artifactType` MUST be set to the  config descriptor `mediaType` value.
    All annotations from the image manifest MUST be copied to this descriptor.
 1. Push the updated referrers list using the same [referrers tag schema](#referrers-tag-schema).