.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
-.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * 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
\fICURLOPT_POSTFIELDS(3)\fP to an empty string, or set \fICURLOPT_POST(3)\fP to
1 and \fICURLOPT_POSTFIELDSIZE(3)\fP to 0.
-Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
-You can disable this header with \fICURLOPT_HTTPHEADER(3)\fP as usual.
+Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header,
+and libcurl will add that header automatically if the POST is either known to
+be larger than 1024 bytes or if the expected size is unknown. You can disable
+this header with \fICURLOPT_HTTPHEADER(3)\fP as usual.
To make multipart/formdata posts (aka RFC2388-posts), check out the
\fICURLOPT_HTTPPOST(3)\fP option combined with \fIcurl_formadd(3)\fP.