Rakefile in porolog-0.0.2 vs Rakefile in porolog-0.0.3

@@ -3,10 +3,11 @@
 #
 #     2 May 2018
 #
 
 require 'rake/testtask'
+require 'yard'
 
 
 # -- Run All Tests Task --
 Rake::TestTask.new do |task|
   task.libs    << 'test'
@@ -23,17 +24,23 @@
     task.pattern    = test_file
     task.warning    = nil
   end
 end
 
+# -- Documentation Task --
+YARD::Rake::YardocTask.new('doc') do |task|
+  task.stats_options = ['--list-undoc']
+end
+
 # -- Tasks --
 task default: :test
 
 desc 'Help'
 task :help do
   puts <<-EOF
     Porolog is a Ruby library.
     See README.md for more information.
+    See doc/index.html for documentation.
     Run
       rake -T
     for other tasks.
   EOF
 end