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

@@ -16,10 +16,14 @@
 
     $ gem install nico
 
 ## Usage
 
-TODO: Write usage instructions here
+From the command line run:
+
+    $ nico
+
+Remember to define the following environment variables: `CAMPFIRE_SUBDOMAIN`, `CAMPFIRE_ROOM_ID` and `CAMPFIRE_TOKEN`.
 
 ## Contributing
 
 1. Fork it
 2. Create your feature branch (`git checkout -b my-new-feature`)