README.rdoc in youpy-scissor-0.0.10 vs README.rdoc in youpy-scissor-0.0.11

@@ -1,31 +1,46 @@
 = Scissor
 
 == Description
-utility to chop mp3 files
 
+utility to chop sound files
+
+supported file format:
+
+* mp3
+* wav
+
+== Installation
+
 == Requirements
 
 * {ruby-mp3info}[http://ruby-mp3info.rubyforge.org/]
-* {FFmpeg}[http://ffmpeg.mplayerhq.hu/]
-* {Ecasound}[http://www.eca.cx/ecasound/]
 
-== Installation
+	gem install ruby-mp3info
 
+* {RiffLib}[http://rubyforge.org/projects/riff/]
+
+	gem install riff
+
+* {FFmpeg}[http://ffmpeg.mplayerhq.hu/]
+* {Ecasound}[http://www.eca.cx/ecasound/] 2.5.0 or higher
+
 === Archive Installation
 
 	rake install
 
 === Gem Installation
 
 	gem install youpy-scissor
 
 == Features/Problems
 
+* When you concatenate two or more files, format(sample rate, bit rate, ...) mismatch causes unexpected changes to output file.
+
 == Synopsis
 
 	 foo = Scissor.new('foo.mp3')
-	 bar = Scissor.new('bar.mp3')
+	 bar = Scissor.new('bar.wav')
 
 	 # concat
 	 (foo + bar).to_file('foobar.mp3')
 
 	 # slice + concat