diff --git a/doc/crypto/bio.pod b/doc/crypto/bio.pod
index 24f61dfb56..f9239226ff 100644
--- a/doc/crypto/bio.pod
+++ b/doc/crypto/bio.pod
@@ -40,7 +40,7 @@ BIO).
 =head1 SEE ALSO
 
 L<BIO_ctrl(3)|BIO_ctrl(3)>,
-L<BIO_f_base64(3)|BIO_f_base64(3)>,
+L<BIO_f_base64(3)|BIO_f_base64(3)>, L<BIO_f_buffer(3)|BIO_f_buffer(3)>,
 L<BIO_f_cipher(3)|BIO_f_cipher(3)>, L<BIO_f_md(3)|BIO_f_md(3)>,
 L<BIO_f_null(3)|BIO_f_null(3)>, L<BIO_f_ssl(3)|BIO_f_ssl(3)>,
 L<BIO_find_type(3)|BIO_find_type(3)>, L<BIO_new(3)|BIO_new(3)>,