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diff --git a/doc/man3/ASN1_item_d2i_bio.pod b/doc/man3/ASN1_item_d2i_bio.pod
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+++ b/doc/man3/ASN1_item_d2i_bio.pod
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+=pod
+
+=head1 NAME
+
+ASN1_item_d2i_bio,
+ASN1_item_i2d_mem_bio
+- decode and encode DER-encoded ASN.1 structures
+
+=head1 SYNOPSIS
+
+ #include <openssl/asn1.h>
+
+ void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *pval);
+ BIO *ASN1_item_i2d_mem_bio(const ASN1_ITEM *it, const ASN1_VALUE *val);
+
+=head1 DESCRIPTION
+
+ASN1_item_d2i_bio() decodes the contents of its input BIO I<in>,
+which must be a DER-encoded ASN.1 structure, using the ASN.1 template I<it>
+and places the result in I<*pval> unless I<pval> is NULL.
+If I<in> is NULL it returns NULL, else a pointer to the parsed structure.
+
+ASN1_item_i2d_mem_bio() encodes the given ASN.1 value I<val>
+using the ASN.1 template I<it> and returns the result in a memory BIO.
+
+=head1 RETURN VALUES
+
+ASN1_item_d2i_bio() returns a pointer to an B<ASN1_VALUE> or NULL.
+
+ASN1_item_i2d_mem_bio() returns a pointer to a memory BIO or NULL on error.
+
+=head1 HISTORY
+
+The functions described here were added in OpenSSL 3.0.
+
+=head1 COPYRIGHT
+
+Copyright 2021 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