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diff --git a/docs/man/nng_msg_realloc.adoc b/docs/man/nng_msg_realloc.adoc
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+= nng_msg_alloc(3)
+//
+// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 Capitar IT Group BV <info@capitar.com>
+//
+// This document 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_alloc - allocate a message
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+
+int nng_msg_realloc(nng_msg *msg, size_t size);
+-----------
+
+== DESCRIPTION
+
+The `nng_msg_realloc()` function re-allocates a message so that it has
+a body of length _size_.  This message attempts to avoid extra allocations,
+and will reuse the existing memory when possible.
+
+TIP: One way to further reduce message allocations is to allocate a message
+larger than needed, then use this function or <<nng_msg_chop#,nng_msg_chop(3)>>
+to reduce the message size to that actually needed.  The extra space left
+over will still be present in the message, so that when the message size
+needs to grow due to this function or <<nng_msg_append#,nng_msg_append(3)>>
+no actual memory allocations need to take place.
+
+NOTE: Pointers to message body and header content obtained prior to this
+function must not be in use, as the underlying memory used for the message
+may have changed, particularly if the message size is increasing.
+
+== RETURN VALUES
+
+This function returns 0 on success, and non-zero otherwise.
+
+== ERRORS
+
+`NNG_ENOMEM`:: Insufficient free memory exists to reallocate a message.
+
+== 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_insert#,nng_msg_insert(3)>>,
+<<nng_msg_len#,nng_msg_len(3)>>,
+<<nng_msg_trim#,nng_msg_trim(3)>>,
+<<nng_strerror#,nng_strerror(3)>>,
+<<nng#,nng(7)>>