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diff --git a/openssl-1.1.0h/doc/crypto/BIO_f_buffer.pod b/openssl-1.1.0h/doc/crypto/BIO_f_buffer.pod
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+++ b/openssl-1.1.0h/doc/crypto/BIO_f_buffer.pod
@@ -0,0 +1,92 @@
+=pod
+
+=head1 NAME
+
+BIO_get_buffer_num_lines,
+BIO_set_read_buffer_size,
+BIO_set_write_buffer_size,
+BIO_set_buffer_size,
+BIO_set_buffer_read_data,
+BIO_f_buffer
+- buffering BIO
+
+=head1 SYNOPSIS
+
+ #include <openssl/bio.h>
+
+ const BIO_METHOD *BIO_f_buffer(void);
+
+ long BIO_get_buffer_num_lines(BIO *b);
+ long BIO_set_read_buffer_size(BIO *b, long size);
+ long BIO_set_write_buffer_size(BIO *b, long size);
+ long BIO_set_buffer_size(BIO *b, long size);
+ long BIO_set_buffer_read_data(BIO *b, void *buf, long num);
+
+=head1 DESCRIPTION
+
+BIO_f_buffer() returns the buffering BIO method.
+
+Data written to a buffering BIO is buffered and periodically written
+to the next BIO in the chain. Data read from a buffering BIO comes from
+an internal buffer which is filled from the next BIO in the chain.
+Both BIO_gets() and BIO_puts() are supported.
+
+Calling BIO_reset() on a buffering BIO clears any buffered data.
+
+BIO_get_buffer_num_lines() returns the number of lines currently buffered.
+
+BIO_set_read_buffer_size(), BIO_set_write_buffer_size() and BIO_set_buffer_size()
+set the read, write or both read and write buffer sizes to B<size>. The initial
+buffer size is DEFAULT_BUFFER_SIZE, currently 4096. Any attempt to reduce the
+buffer size below DEFAULT_BUFFER_SIZE is ignored. Any buffered data is cleared
+when the buffer is resized.
+
+BIO_set_buffer_read_data() clears the read buffer and fills it with B<num>
+bytes of B<buf>. If B<num> is larger than the current buffer size the buffer
+is expanded.
+
+=head1 NOTES
+
+These functions, other than BIO_f_buffer(), are implemented as macros.
+
+Buffering BIOs implement BIO_gets() by using BIO_read() operations on the
+next BIO in the chain. By prepending a buffering BIO to a chain it is therefore
+possible to provide BIO_gets() functionality if the following BIOs do not
+support it (for example SSL BIOs).
+
+Data is only written to the next BIO in the chain when the write buffer fills
+or when BIO_flush() is called. It is therefore important to call BIO_flush()
+whenever any pending data should be written such as when removing a buffering
+BIO using BIO_pop(). BIO_flush() may need to be retried if the ultimate
+source/sink BIO is non blocking.
+
+=head1 RETURN VALUES
+
+BIO_f_buffer() returns the buffering BIO method.
+
+BIO_get_buffer_num_lines() returns the number of lines buffered (may be 0).
+
+BIO_set_read_buffer_size(), BIO_set_write_buffer_size() and BIO_set_buffer_size()
+return 1 if the buffer was successfully resized or 0 for failure.
+
+BIO_set_buffer_read_data() returns 1 if the data was set correctly or 0 if
+there was an error.
+
+=head1 SEE ALSO
+
+L<BIO(3)>,
+L<BIO_reset(3)>,
+L<BIO_flush(3)>,
+L<BIO_pop(3)>,
+L<BIO_ctrl(3)>.
+
+=head1 COPYRIGHT
+
+Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (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