diff --git a/_format/1.1/index.md b/_format/1.1/index.md
index 8c5065e4a..3ed722af8 100644
--- a/_format/1.1/index.md
+++ b/_format/1.1/index.md
@@ -752,8 +752,9 @@ of this member **MUST** be an object (a "links object").
Within this object, a link **MUST** be represented as either:
* a string whose value is a URI-reference [[RFC3986 Section 4.1](https://tools.ietf.org/html/rfc3986#section-4.1)]
- pointing to the link's target.
-* a [link object].
+ pointing to the link's target,
+* a [link object] or
+* `null` if the link does not exist.
A link's relation type **SHOULD** be inferred from the name of the link unless the
link is a [link object] and the link object has a `rel` member.
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