README.md in number_average-0.1.5 vs README.md in number_average-0.1.6

@@ -20,10 +20,18 @@
 
     $ gem install number_average
 
 ## Usage
 
-TODO: Write usage instructions here
+Get the average of array element
+
+require 'number_average'
+
+arr = [2,3,5]
+
+puts arr.average
+
+    > 3.333
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.