README.md in mireru-0.0.4 vs README.md in mireru-0.0.5

@@ -6,10 +6,22 @@
 
     $ gem install mireru
 
 ## Usage
 
+### Launch
+
     $ mireru [FILE...]
+
+If no argument then search current directory.
+
+### Keybind
+
+n: next
+
+p: prev
+
+q: quit
 
 ## Contributing
 
 1. Fork it
 2. Create your feature branch (`git checkout -b my-new-feature`)