diff --git a/LICENSE b/LICENSE
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+++ b/LICENSE
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+MIT License
+
+Copyright (c) 2018 Zhenwei Wu
+
+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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+# FFTViewer
+A simple visualization tool of mp3 files using Fast Fourier Transformation.
+
+Very useful tool for making notations of the melody or identifying the chords in a piece of music.
+
+## Usage
+* Open a mp3 file (no supports for other formats) in the dialog.
+* Use the 3 buttons at the top right ([>]  [ || ]  [O]) to control the playing.
+* Double click on the top bar to play from any position.
+* Use the 2 buttons on the right ([+] [-]) to control the height of the peaks and the color of the spectrum.
+* Use the 4 buttons on the left ([<<] [<] [>] [>>]) to move peaks to the left or right, for music in scales other than C major or A minor.
+
+## Screenshot
+![Screenshot](Screenshots/1.PNG)