diff --git a/README.md b/README.md
index a0d1318c..429294c9 100644
--- a/README.md
+++ b/README.md
@@ -52,13 +52,18 @@ You can use the program to listen MIDI files or to create audio files (like MP3
 
 ~~~
 $ ./sonivoxrender -h
-Usage: ./sonivoxrender [-h] [-d file.dls] [-r 0..4] [-w 0..32765] file.mid ...
+Usage: ./sonivoxrender [-h|--help] [-v|--version] [-d|--dls file.dls] [-r|--reverb 0..4] [-w|--wet 0..32767] [-n|--dry 0..32767] [-c|--chorus 0..4] [-l|--level 0..32767] [-g|--gain 0..100] file.mid ...
 Render standard MIDI files into raw PCM audio.
 Options:
-    -h              this help message.
-    -d file.dls     DLS soundfont.
-    -r n            reverb preset: 0=no, 1=large hall, 2=hall, 3=chamber, 4=room.
-    -w n            reverb wet: 0..32765.
+        -h, --help              this help message.
+        -v, --version           sonivox version.
+        -d, --dls file.dls      DLS soundfont.
+        -r, --reverb n  reverb preset: 0=no, 1=large hall, 2=hall, 3=chamber, 4=room.
+        -w, --wet n             reverb wet: 0..32767.
+        -n, --dry n             reverb dry: 0..32767.
+        -c, --chorus n  chorus preset: 0=no, 1..4=presets.
+        -l, --level n           chorus level: 0..32767.
+        -g, --gain n            master gain: 0..100.
 ~~~
 
 The following examples assume the default option USE_44KHZ=ON: