diff --git a/01.md b/01.md
index 0e68de5e..a6dc6bad 100644
--- a/01.md
+++ b/01.md
@@ -30,7 +30,9 @@ The only object type that exists is the `event`, which has the following format
 }
 ```
 
-To obtain the `event.id`, we `sha256` the serialized event. The serialization is done over the UTF-8 JSON-serialized string (with no white space or line breaks) of the following structure:
+The object MUST conform to the I-JSON ([RFC 7493](https://www.rfc-editor.org/rfc/rfc7493.html)) subset of JSON. 
+
+To obtain the `event.id`, we `sha256` the serialized event. The event data is structured as follows and serialized according to the JSON Canonicalization Scheme ([RFC 8785](https://www.rfc-editor.org/rfc/rfc8785)):
 
 ```json
 [