diff --git a/format/index.md b/format/index.md
index 26b153459..89867e461 100644
--- a/format/index.md
+++ b/format/index.md
@@ -238,6 +238,10 @@ this object can contain members keyed by any string valid for this specification
All members which appear in an "attributes object" are considered attributes and
may contain any valid JSON value.
+Complex data structures involving JSON objects and arrays are allowed as
+attribute values. However, any object that constitutes or is contained in an
+attribute **MUST** reserve the `relationships` and `links` members for future use.
+
Although has-one foreign keys (e.g. `author_id`) are often stored internally
alongside other information to be represented in a resource object, these keys
**SHOULD NOT** appear as attributes. If relations are provided, they **MUST**
pFad - Phonifier reborn
Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.
Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.
Alternative Proxies:
Alternative Proxy
pFad Proxy
pFad v3 Proxy
pFad v4 Proxy