In the Standard Algorithm Names specification, the description of the ECDH KeyAgreement algorithm says:

Elliptic Curve Diffie-Hellman as defined in ANSI X9.63 and as described in RFC 3278: "Use of Elliptic Curve Cryptography (ECC) Algorithms in Cryptographic Message Syntax (CMS)."

RFC 3278 describes how to use ECC algorithms in CMS/PKCS7. This does not define the ECDH algorithm. This reference should be removed from the description.