Below STANDARDS, reference the two most relevant sections of RFC 5652.

Given that RFC 5652 does not override the earlier (and simpler)
standards but instead strives to remain compatible, referencing
both the original and the latest versions seems helpful.

OK tb@

1 files changed, 5 insertions, 1 deletions

diff --git a/src/lib/libcrypto/man/PKCS7_add_attribute.3 b/src/lib/libcrypto/man/PKCS7_add_attribute.3
index 5b284b7b57..e7c8c734c4 100644
--- a/src/lib/libcrypto/man/PKCS7_add_attribute.3
+++ b/src/lib/libcrypto/man/PKCS7_add_attribute.3
@@ -1,4 +1,4 @@
-.\" $OpenBSD: PKCS7_add_attribute.3,v 1.5 2025/07/27 07:13:24 tb Exp $
+.\" $OpenBSD: PKCS7_add_attribute.3,v 1.6 2025/07/27 19:31:20 schwarze Exp $
 .\"
 .\" Copyright (c) 2020 Ingo Schwarze <schwarze@openbsd.org>
 .\"
@@ -307,6 +307,10 @@ RFC 2985: PKCS #9: Selected Object Classes and Attribute Types Version 2.0,
 section 5.3: Attribute types for use in PKCS #7 data
 and section 5.6: Attributes defined in S/MIME
 .Pp
+RFC 5652: Cryptographic Message Syntax (CMS),
+section 5.3: SignerInfo Type
+and section 11: Useful Attributes
+.Pp
 RFC 8551: Secure/Multipurpose Internet Mail Extensions (S/MIME)
 Version 4.0 Message Specification,
 section 2.5.2: SMIMECapabilities Attribute