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+= nng_msg_insert(3)
+:doctype: manpage
+:manmanual: nng
+:mansource: nng
+:manvolnum: 3
+:copyright: Copyright 2018 Staysail Systems, Inc. <info@staysail.tech> \
+            Copyright 2018 Capitar IT Group BV <info@capitar.com> \
+            This software is supplied under the terms of the MIT License, a \
+            copy of which should be located in the distribution where this \
+            file was obtained (LICENSE.txt).  A copy of the license may also \
+            be found online at https://opensource.org/licenses/MIT.
+
+== NAME
+
+nng_msg_insert, nng_msg_insert_u32 - prepend to message body
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+
+int nng_msg_insert(nng_msg *msg, const void *val, size_t size);
+int nng_msg_insert(nng_msg *msg, uint32_t val32);
+-----------
+
+== DESCRIPTION
+
+The `nng_msg_insert()` and `nng_msg_insert_u32()` functions prepend data to
+the front of the body of message _msg_, reallocating it if necessary.
+The first function prepends _size_ bytes, copying them from _val_.  The
+second function prepends the value _val32_ in network-byte order (big-endian).
+
+TIP: This function makes use of pre-allocated "headroom" in the message if
+available, so it can often avoid performing any reallocation.  Applications
+should use this instead of reallocating and copying message content themselves,
+in order to benefit from this capabilitiy.
+
+== RETURN VALUES
+
+This function returns 0 on success, and non-zero otherwise.
+
+== ERRORS
+
+`NNG_ENOMEM`:: Insufficient free memory exists.
+
+== SEE ALSO
+
+<<nng_msg_alloc#,nng_msg_alloc(3)>>,
+<<nng_msg_append#,nng_msg_append(3)>>,
+<<nng_msg_body#,nng_msg_body(3)>>,
+<<nng_msg_chop#,nng_msg_chop(3)>>,
+<<nng_msg_free#,nng_msg_free(3)>>,
+<<nng_msg_len#,nng_msg_len(3)>>,
+<<nng_msg_realloc#,nng_msg_realloc(3)>>,
+<<nng_msg_trim#,nng_msg_trim(3)>>,
+<<nng_strerror#,nng_strerror(3)>>,
+<<nng#,nng(7)>>
+
+== COPYRIGHT
+
+Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] +
+Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV]
+
+This document is supplied under the terms of the
+https://opensource.org/licenses/MIT[MIT License].