Introduction [RFC2311] first defined the application/pkcs10 media type. When [RFC2633] was published@ the application/pkcs10 section was dropped@ but for some reason the text was not incorporated into the PKCS #10 document [RFC2986]. [RFC2311] was moved to Historic status by [RFC5751]. To ensure the IANA media type registration points to a non-Historic document@ this document updates [RFC2986] with the definition of the application/pkcs10 media type and an IANA registration based on [RFC4288]. The text for Section 2 is adapted from Section 3.7 of [RFC2311].