README.md in mml2wav-0.0.1 vs README.md in mml2wav-0.0.2

@@ -1,6 +1,6 @@
-# mml2wav
+# mml2wav [![Gem Version](https://badge.fury.io/rb/mml2wav.svg)](http://badge.fury.io/rb/mml2wav)
 
 MML (Music Macro Language) to WAV audio converter by Ruby.
 
 ## Dependencies
 
@@ -30,14 +30,28 @@
 f   | fa
 g   | so
 a   | la
 b   | si
 
+### length
+
+MML | length
+--- | -----------------------------
+c4  | 1/4 (default)
+c8  | 1/8
+c16 | 1/16
+c.  | 1.5 times longer than default
+
 ### signs
 
 MML | mean
---- | ------
+--- | --------------
 r   | rest
+t90 | BPM
+l4  | default length
+o4  | octave
+<   | up octave
+>   | down octave
 
 ## License
 
 MIT License. See LICENSE.txt for details.