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diff --git a/decoders/numbers_and_state/__init__.py b/decoders/numbers_and_state/__init__.py
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+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2019 Comlab AG
+## Copyright (C) 2020 Gerhard Sittig <gerhard.sittig@gmx.net>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, see <http://www.gnu.org/licenses/>.
+##
+
+'''
+This protocol decoder takes a set of logic input signals, and interprets
+their bit pattern according to user specifications as different kinds of
+numbers, or an enumeration of e.g. machine states.
+
+Supported formats are: signed and unsigned integers, fixed point numbers,
+IEEE754 floating point numbers, and number to text mapping controlled by
+external data files. (Support for half precision floats depends on the
+Python runtime, and may not universally be available.)
+
+User provided text mapping files can either use the JSON format:
+  {"one": 1, "two": 2, "four": 4}
+or the Python programming language:
+  enumtext = { 1: "one", 2: "two", 3: "three", }
+
+In addition to all enum values on one row (sequential presentation of
+the data), a limited number of enum values also are shown in tabular
+presentation, which can help visualize state machines or task switches.
+'''
+
+from .pd import Decoder