diff --git a/Makefile b/Makefile
index 0d6c96500..05e033e82 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ DOC_FILES := \
 	layer.md \
 	config.md \
 	annotations.md \
-	canonicalization.md
+	considerations.md
 
 FIGURE_FILES := \
 	img/media-types.png
diff --git a/canonicalization.md b/considerations.md
similarity index 84%
rename from canonicalization.md
rename to considerations.md
index 3875ad271..e2e8f4ccd 100644
--- a/canonicalization.md
+++ b/considerations.md
@@ -1,3 +1,8 @@
+# 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.
+
 # Canonicalization
 
 OCI Images [are](descriptor.md) [content-addressable](image-layout.md).
diff --git a/manifest-list.md b/manifest-list.md
index fe6b71775..42e51c6a3 100644
--- a/manifest-list.md
+++ b/manifest-list.md
@@ -71,10 +71,6 @@ For the media type(s) that this document is compatible with, see the [matrix][ma
 
     See [Pre-Defined Annotation Keys](annotations.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.
-
 ## Example Manifest List
 
 *Example showing a simple manifest list pointing to image manifests for two platforms:*
diff --git a/manifest.md b/manifest.md
index a720fcd90..0e8e985fe 100644
--- a/manifest.md
+++ b/manifest.md
@@ -66,10 +66,6 @@ Unlike the [Manifest List](manifest-list.md), which contains information about a
 
     See [Pre-Defined Annotation Keys](annotations.md#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:*
diff --git a/spec.md b/spec.md
index a6590e1ed..fdffd0e8b 100644
--- a/spec.md
+++ b/spec.md
@@ -18,7 +18,9 @@ The goal of this specification is to enable the creation of interoperable tools
 - [Filesystem Layers](layer.md)
 - [Image Configuration](config.md)
 - [Annotations](annotations.md)
-- [Canonicalization](canonicalization.md)
+- [Considerations](considerations.md)
+    - [Extensibility](considerations.md#extensibility)
+    - [Canonicalization](considerations.md#canonicalization)
 
 # Notational Conventions