diff --git a/spec.md b/spec.md
index 7b6f95b2..6df4996c 100644
--- a/spec.md
+++ b/spec.md
@@ -73,7 +73,7 @@ Several terms are used frequently in this document and warrant basic definitions
- **Object**: one conceptual piece of content stored as blobs with an accompanying manifest. (This was previously described as an "artifact")
- **Descriptor**: a reference that describes the type, metadata and content address of referenced content. Descriptors are defined under the OCI Image Spec [apdx-5](#appendix).
- **Digest**: a unique identifier created from a cryptographic hash of a Blob's content. Digests are defined under the OCI Image Spec [apdx-3](#appendix)
-- **Tag**: a custom, human-readable manifest identifier
+- **Tag**: a custom, human-readable pointer to a manifest. A manifest digest may have zero, one, or many tags referencing it.
- **Subject**: an association from one manifest to another, typically used to attach an artifact to an image.
- **Referrers List**: a list of manifests with a subject relationship to a specified digest. The referrers list is generated with a [query to a registry](#listing-referrers).
@@ -675,6 +675,8 @@ If tag deletion is disabled, the registry MUST respond with either a `400 Bad Re
To delete a tag, perform a `DELETE` request to a path in the following format: `/v2//manifests/` [end-9](#endpoints)
+Once deleted, a `GET` to `/v2//manifests/` will return a 404.
+
##### Deleting Manifests
To delete a manifest, perform a `DELETE` request to a path in the following format: `/v2//manifests/` [end-9](#endpoints)
@@ -683,6 +685,8 @@ To delete a manifest, perform a `DELETE` request to a path in the following form
Upon success, the registry MUST respond with a `202 Accepted` code.
If the repository does not exist, the response MUST return `404 Not Found`.
+Once deleted, a `GET` to `/v2//manifests/` and any tag pointing to that digest will return a 404.
+
When deleting an image manifest that contains a `subject` field, and the [referrers API](#listing-referrers) returns a 404, clients SHOULD:
1. Pull the referrers list using the [referrers tag schema](#referrers-tag-schema).