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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_TCP_FASTOPEN 3 "16 Feb 2016" "libcurl 7.49.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_TCP_FASTOPEN \- enable TCP Fast Open
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_FASTOPEN, long enable);
+.SH DESCRIPTION
+Pass a long as parameter set to 1L to enable or 0 to disable.
+
+TCP Fast Open (RFC7413) is a mechanism that allows data to be carried in the
+SYN and SYN-ACK packets and consumed by the receiving end during the initial
+connection handshake, saving up to one full round-trip time (RTT).
+.SH DEFAULT
+0
+.SH PROTOCOLS
+All
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
+  curl_easy_setopt(curl, CURLOPT_TCP_FASTOPEN, 1L);
+  curl_easy_perform(curl);
+}
+.fi
+.SH AVAILABILITY
+Added in 7.49.0. This option is currently only supported on Linux and  OS X
+El Capitan.
+.SH RETURN VALUE
+Returns CURLE_OK if fast open is supported by the operating system, otherwise
+returns CURLE_NOT_BUILT_IN.