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diff --git a/crypto/openssl/doc/man3/BIO_new.pod b/crypto/openssl/doc/man3/BIO_new.pod
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index 000000000000..8c4c5bcc8373
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+++ b/crypto/openssl/doc/man3/BIO_new.pod
@@ -0,0 +1,79 @@
+=pod
+
+=head1 NAME
+
+BIO_new_ex, BIO_new, BIO_up_ref, BIO_free, BIO_vfree, BIO_free_all
+- BIO allocation and freeing functions
+
+=head1 SYNOPSIS
+
+ #include <openssl/bio.h>
+
+ BIO *BIO_new_ex(OSSL_LIB_CTX *libctx, const BIO_METHOD *type);
+ BIO *BIO_new(const BIO_METHOD *type);
+ int BIO_up_ref(BIO *a);
+ int BIO_free(BIO *a);
+ void BIO_vfree(BIO *a);
+ void BIO_free_all(BIO *a);
+
+=head1 DESCRIPTION
+
+The BIO_new_ex() function returns a new BIO using method B<type> associated with
+the library context I<libctx> (see OSSL_LIB_CTX(3)). The library context may be
+NULL to indicate the default library context. I<type> B<MUST NOT> be NULL.
+
+The BIO_new() is the same as BIO_new_ex() except the default library context is
+always used.
+
+BIO_up_ref() increments the reference count associated with the BIO object.
+
+BIO_free() frees up a single BIO, BIO_vfree() also frees up a single BIO
+but it does not return a value.
+If B<a> is NULL nothing is done.
+Calling BIO_free() may also have some effect
+on the underlying I/O structure, for example it may close the file being
+referred to under certain circumstances. For more details see the individual
+BIO_METHOD descriptions.
+
+BIO_free_all() frees up an entire BIO chain, it does not halt if an error
+occurs freeing up an individual BIO in the chain.
+If B<a> is NULL nothing is done.
+
+=head1 RETURN VALUES
+
+BIO_new_ex() and BIO_new() return a newly created BIO or NULL if the call fails.
+
+BIO_up_ref() and BIO_free() return 1 for success and 0 for failure.
+
+BIO_free_all() and BIO_vfree() do not return values.
+
+=head1 NOTES
+
+If BIO_free() is called on a BIO chain it will only free one BIO resulting
+in a memory leak.
+
+Calling BIO_free_all() on a single BIO has the same effect as calling BIO_free()
+on it other than the discarded return value.
+
+=head1 HISTORY
+
+BIO_set() was removed in OpenSSL 1.1.0 as BIO type is now opaque.
+
+BIO_new_ex() was added in OpenSSL 3.0.
+
+=head1 EXAMPLES
+
+Create a memory BIO:
+
+ BIO *mem = BIO_new(BIO_s_mem());
+
+=head1 COPYRIGHT
+
+Copyright 2000-2021 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