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diff --git a/doc/sphinx/mes2doc.py b/doc/sphinx/mes2doc.py
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+#!/usr/bin/env python3
+
+# Copyright (C) 2019-2021 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http:#mozilla.org/MPL/2.0/.
+
+# Produce System Messages Manual
+#
+# This tool reads all the message files given on the command line.
+# It pulls all the messages and description out, sorts them by
+# message ID, and writes them out as a single (formatted) file.
+#
+# Invocation:
+# The code is invoked using the command line:
+#
+# system_messages.py [-o <output-file>] <files>
+#
+# If no output file is specified, output is written to stdout.
+# The produced format is ReStructuredText.
+
+import re
+import argparse
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(description='Convert set of *.mes files to .rst documentation format')
+    parser.add_argument('-o', '--output', help='Output file name (default to stdout).')
+    parser.add_argument('files', help='Input .mes files.', nargs='+')
+
+    args = parser.parse_args()
+    return args
+
+
+def read_input_files(files):
+    messages = {}
+    for f in files:
+        with open(f) as fp:
+            print("Processing %s" % f)
+            namespace = None
+            msg_descr = None
+            msg_id = None
+            msg_text = None
+            for line in fp.readlines():
+                line = line.strip()
+
+                if not line or line.startswith('#'):
+                    pass
+
+                elif line.startswith('$'):
+                    pass
+
+                elif line.startswith('%'):
+                    # end previous message
+                    if msg_id is not None:
+                        section = msg_id.split('_')[0]
+                        messages[msg_id] = (section, msg_id, msg_text, msg_descr)
+
+                    # start next message
+                    m = re.search('^%\s?([A-Z0-9_]+)\s+(.*)', line);
+                    msg_id, msg_text = m.groups()
+                    msg_descr = []
+
+                else:
+                    msg_descr.append(line)
+
+    return messages
+
+
+def generate_rst(messages):
+    rst = '''.. _kea-messages:
+
+###################
+Kea Messages Manual
+###################
+
+Kea is an open source implementation of the Dynamic Host Configuration
+Protocol (DHCP) servers, developed and maintained by Internet Systems
+Consortium (ISC).
+
+This is the reference guide for Kea version |release|.
+Links to the most up-to-date version of this document (in PDF, HTML,
+and plain text formats), along with other useful information about
+Kea, can be found in ISC's `Knowledgebase <https://kea.readthedocs.io>`_.
+
+Please note that in the messages below, the percent sign ("%") followed by a number is
+used to indicate a placeholder for data that is provided by the Kea code during its operation.
+
+
+.. toctree::
+   :numbered:
+   :maxdepth: 5
+
+'''
+
+    prev_section = None
+    for _, msg in sorted(messages.items()):
+        section, msg_id, msg_text, msg_descr = msg
+
+        if section != prev_section:
+            prev_section = section
+            rst += section + '\n'
+            rst += '~' * len(section) + '\n\n'
+
+        rst += '**' + msg_id + '**\n\n'
+
+        rst += msg_text + '\n\n'
+
+        rst += ''.join(['  ' + l + '\n' for l in msg_descr])
+        rst += '\n'
+
+
+    return rst
+
+def generate(in_files, out_file):
+    messages = read_input_files(in_files)
+
+    rst = generate_rst(messages)
+
+    if out_file:
+        with open(out_file, 'w') as f:
+            f.write(rst)
+        print('Wrote generated RST content to: %s' % out_file)
+    else:
+        print(rst)
+
+
+def main():
+    args = parse_args()
+    generate(args.files, args.output)
+
+
+if __name__ == '__main__':
+    main()