diff --git a/LICENSE.txt b/LICENSE.txt
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+Copyright (c) 2015 Andras Veres-Szentkiralyi
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
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+Spark.io Alarm Clock
+====================
+
+An alarm clock with a mood light based on Spark Core and Spark Button.
+
+Implementations
+---------------
+
+ - The Spark.io firmware can be found in the `firmware` directory.
+ - An Android app can be found in the `android` directory.
+
+Protocol design
+---------------
+
+UDP is used over IP, the base port is 42620 (the meaning of life + 620 for
+default time), discovery happens on 42621.
+
+### Discovery ###
+
+The app can only be used on the local network (LAN), the app sends a packet
+on the discovery port (42621) to the broadcast address, and waits for three
+seconds for at most 30 replies. Replies must be sent to the same port and
+must contain an ASCII encoded nick name as the sole payload. In case of
+Spark.io devices, this is the unique ID.
+
+### Setting the alarm ###
+
+An alarm contains two properties, a 24-bit color in the RGB space, and the
+time of the alarm with minute precision. It is up to the device to interpret
+the time of the alarm (default on Spark Core is UTC). The packet is sent to
+the base port (42620) and contains a five byte payload:
+
+ - red component (0-255)
+ - green component (0-255)
+ - blue component (0-255)
+ - hour of alarm (0-23)
+ - minute of alarm (0-59)
+
+The reply must be a packet with the ASCII encoded `ACK` as its payload on
+the same port, the Android app tries to send the set alarm packet 4 times,
+with 500 ms timeout.
+
+Dependencies
+------------
+
+The AmbilWarna color picker (see below) is included in the source tree,
+you'll need to get the Spark Button driver from [its GitHub repository][1].
+
+License
+-------
+
+The whole project is available under MIT license, see `LICENSE.txt`.
+
+The color picker dialog is [AmbilWarna by Pascal Cans and Justin Warner][2]
+available under Apache License 2.0.
+
+  [1]: https://github.com/jenesaisdiq/SparkButton
+  [2]: https://code.google.com/p/android-color-picker/