DID v1.0 spec - key agreement property example

In the DID v1.0 spec, section 5.3.3 Key Agreement, example 17, I'm
wondering if the "@context" is incomplete. Should it include the key
agreement IRI? I looked up and found "
https://w3id.org/security/suites/x25519-2019/v1".

Please help me understand what I'm missing in my reading.

Thank you!
Devi Prasad