diff --git a/Rakefile b/Rakefile
index 4b8fee4..b5cb435 100644
--- a/Rakefile
+++ b/Rakefile
@@ -2,7 +2,7 @@ require 'rspec/core/rake_task'
 
 desc 'Run rspec tests with coloring.'
 RSpec::Core::RakeTask.new(:test) do |t|
-  t.rspec_opts = %w[--color]
+  t.rspec_opts = %w[--color --format documentation]
   t.pattern    = 'spec/'
 end
 
@@ -12,4 +12,4 @@ RSpec::Core::RakeTask.new(:junit) do |t|
   t.pattern    = 'spec/'
 end
 
-task :default => [:test]
\ No newline at end of file
+task :default => [:test]