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diff --git a/doc/man3/CMS_add1_signing_cert.pod b/doc/man3/CMS_add1_signing_cert.pod
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+++ b/doc/man3/CMS_add1_signing_cert.pod
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+=pod
+
+=head1 NAME
+
+CMS_add1_signing_cert, CMS_add1_signing_cert_v2
+- add ESS signing-certificate signed attribute to a
+CMS_SignerInfo data structure
+
+=head1 SYNOPSIS
+
+ #include <openssl/cms.h>
+
+ int CMS_add1_signing_cert(CMS_SignerInfo *si, ESS_SIGNING_CERT *sc);
+
+ int CMS_add1_signing_cert_v2(CMS_SignerInfo *si, ESS_SIGNING_CERT_V2 *sc2);
+
+=head1 DESCRIPTION
+
+CMS_add1_signing_cert() adds an ESS Signing Certificate B<sc> (version 1) signed
+attribute to the CMS_SignerInfo B<si>.
+CMS_add1_signing_cert_v2() adds an ESS Signing Certificate B<sc2> (version 2) signed
+attribute to the CMS_SignerInfo B<si>.
+The ESS Signing Certificate attributes version 1 and 2 are defined in RFC 5035
+which updates Section 5.4 of RFC 2634.
+
+=head1 NOTES
+
+This attribute is mandatory to make a CMS compliant with CAdES-BES
+(European Standard ETSI EN 319 122-1 V1.1.1).
+For a fuller description see L<cms(1)>).
+
+=head1 RETURN VALUES
+
+CMS_add1_signing_cert() and CMS_add1_signing_cert_v2() return 1 if attribute is added or 0 if an error occurred.
+
+=head1 COPYRIGHT
+
+Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut