diff --git a/Makefile b/Makefile
index 9db7dec2d..ff6cca493 100644
--- a/Makefile
+++ b/Makefile
@@ -31,6 +31,7 @@ DOC_FILES := \
 	config.md \
 	manifest.md \
 	manifest-list.md \
+	extensibility.md \
 	canonicalization.md
 
 FIGURE_FILES := \
diff --git a/README.md b/README.md
index 756086dbd..cdc8ac8ff 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ The OCI Image Format project creates and maintains the software shipping contain
 - [Image Configuration](config.md)
 - [Image Manifest](manifest.md)
 - [Image Manifest List](manifest-list.md)
+- [Extensibility](extensibility.md)
 - [Canonicalization](canonicalization.md)
 
 ## Overview
diff --git a/extensibility.md b/extensibility.md
new file mode 100644
index 000000000..e5f5f8c6e
--- /dev/null
+++ b/extensibility.md
@@ -0,0 +1,4 @@
+# Extensibility
+
+Implementations that are reading/processing [manifests](manifest.md) or [manifest lists](manifest-list.md) MUST NOT generate an error if they encounter an unknown property.
+Instead they MUST ignore unknown properties.
diff --git a/manifest-list.md b/manifest-list.md
index b3aef15fe..085b07ad8 100644
--- a/manifest-list.md
+++ b/manifest-list.md
@@ -66,20 +66,7 @@ This section defines the `application/vnd.oci.image.manifest.list.v1+json` [medi
 
 - **`annotations`** *string-string map*
 
-    This OPTIONAL property contains arbitrary metadata for the manifest list.
-    Annotations MUST be a key-value map where both the key and value MUST be strings.
-    While the value MUST be present, it MAY be an empty string.
-    Keys MUST be unique within this map, and best practice is to namespace the keys.
-    Keys SHOULD be named using a reverse domain notation - e.g. `com.example.myKey`.
-    Keys using the `org.opencontainers` namespace are reserved and MUST NOT be used by other specifications.
-    If there are no annotations then this property MUST either be absent or be an empty map.
-    Implementations that are reading/processing manifest lists MUST NOT generate an error if they encounter an unknown annotation key.
-
-    See [Pre-Defined Annotation Keys](manifest.md#pre-defined-annotation-keys).
-
-### Extensibility
-Implementations that are reading/processing manifest lists MUST NOT generate an error if they encounter an unknown property.
-Instead they MUST ignore unknown properties.
+    This OPTIONAL property contains arbitrary metadata for the manifest list with the same semantics as the [manifest's `annotations`](manifest.md#image-manifest-property-descriptions)
 
 ## Example Manifest List
 
diff --git a/manifest.md b/manifest.md
index 71fc35bb8..3979ca336 100644
--- a/manifest.md
+++ b/manifest.md
@@ -71,10 +71,6 @@ Unlike the [Manifest List](manifest-list.md), which contains information about a
 
     See [Pre-Defined Annotation Keys](#pre-defined-annotation-keys).
 
-### Extensibility
-Implementations that are reading/processing image manifests MUST NOT generate an error if they encounter an unknown property.
-Instead they MUST ignore unknown properties.
-
 ## Example Image Manifest
 
 *Example showing an image manifest:*