d2i_PKCS7_bio_stream() docs.

diff --git a/doc/crypto/d2i_PKCS7_bio_stream.pod b/doc/crypto/d2i_PKCS7_bio_stream.pod
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+=pod
+
+=head1 NAME
+
+d2i_PKCS7_bio_stream - output PKCS7 structure in BER format.
+
+=head1 SYNOPSIS
+
+ #include <openssl/pkcs7.h>
+
+ int d2i_PKCS7_bio_stream(BIO *out, PKCS7 *p7, BIO *data, int flags);
+
+=head1 DESCRIPTION
+
+d2i_PKCS7_bio_stream() outputs a PKCS7 structure structure in BER format.
+
+It is otherwise identical to the function SMIME_write_PKCS7().
+
+=head1 NOTES
+
+This function is effectively a version of the d2i_PKCS7_bio() supporting
+streaming.
+
+=head1 BUGS
+
+The prefix "d2i" is arguably wrong because the function outputs BER format.
+
+=head1 RETURN VALUES
+
+d2i_PKCS7_bio_stream() returns 1 for success or 0 for failure.
+
+=head1 SEE ALSO
+
+L<ERR_get_error(3)|ERR_get_error(3)>, L<PKCS7_sign(3)|PKCS7_sign(3)>,
+L<PKCS7_verify(3)|PKCS7_verify(3)>, L<PKCS7_encrypt(3)|PKCS7_encrypt(3)>
+L<PKCS7_decrypt(3)|PKCS7_decrypt(3)>,
+L<SMIME_write_PKCS7(3)|SMIME_write_PKCS7(3)>,
+L<PEM_write_bio_PKCS7_stream(3)|PEM_write_bio_PKCS7_stream(3)>
+
+=head1 HISTORY
+
+d2i_PKCS7_bio_stream() was added to OpenSSL 0.9.9
+
+=cut