diff --git a/config.md b/config.md
index 5d6953083..a7c458838 100644
--- a/config.md
+++ b/config.md
@@ -30,6 +30,8 @@ Layers SHOULD be packed and unpacked reproducibly to avoid changing the layer Di
 
 NOTE: Do not confuse DiffIDs with [layer digests](manifest.md#image-manifest-property-descriptions), often referenced in the manifest, which are digests over compressed or uncompressed content.
 
+For erofs and squashfs layers, a layer DiffID is the digest over the layer itself.
+
 ### Layer ChainID
 
 For convenience, it is sometimes useful to refer to a stack of layers with a single identifier.
diff --git a/layer.md b/layer.md
index a5c692f41..035df8f1c 100644
--- a/layer.md
+++ b/layer.md
@@ -20,6 +20,8 @@ This section defines the `application/vnd.oci.image.layer.v1.tar`, `application/
 
 - Layer Changesets for the [media type](media-types.md) `application/vnd.oci.image.layer.v1.tar` MUST be packaged in [tar archive][tar-archive].
 - Layer Changesets for the [media type](media-types.md) `application/vnd.oci.image.layer.v1.tar` MUST NOT include duplicate entries for file paths in the resulting [tar archive][tar-archive].
+- Layer Changesets for the [media type](media-types.md) `application/vnd.oci.image.layer.v1.erofs` MUST be packaged in [erofs file][erofs].
+- Layer Changesets for the [media type](media-types.md) `application/vnd.oci.image.layer.v1.squashfs` MUST be packaged in [squashfs file][squashfs].
 
 ## Change Types
 
@@ -365,3 +367,5 @@ Implementations SHOULD NOT upload layers tagged with this media type; however, s
 [rfc1952_2]: https://tools.ietf.org/html/rfc1952
 [tar-archive]: https://en.wikipedia.org/wiki/Tar_(computing)
 [rfc8478]: https://tools.ietf.org/html/rfc8478
+[squashfs]: https://github.com/plougher/squashfs-tools
+[erofs]: https://erofs.docs.kernel.org/
diff --git a/specs-go/v1/mediatype.go b/specs-go/v1/mediatype.go
index ce8313e79..e0df5b3a2 100644
--- a/specs-go/v1/mediatype.go
+++ b/specs-go/v1/mediatype.go
@@ -45,6 +45,14 @@ const (
 	// MediaTypeImageLayerZstd is the media type used for zstd compressed
 	// layers referenced by the manifest.
 	MediaTypeImageLayerZstd = "application/vnd.oci.image.layer.v1.tar+zstd"
+
+	// MediaTypeErofs specifies the media type as erofs filesystem layer
+	// https://www.iana.org/assignments/media-types/application/vnd.erofs
+	MediaTypeErofs = "application/vnd.oci.image.layer.v1.erofs"
+
+	// MediaTypeSquashfs specifies the media type as squashfs filesystem layer
+	// https://github.com/plougher/squashfs-tools
+	MediaTypeSquashfs = "application/vnd.oci.image.layer.v1.squashfs"
 )
 
 // Non-distributable layer media-types.