diff --git a/Rakefile b/Rakefile
index 29955274..10e14b23 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1 +1,13 @@
 require "bundler/gem_tasks"
+
+namespace "build" do
+  desc "build parser from parser.y by using Racc"
+  task :racc_parser do
+    `bundle exec racc parser.y -o lib/lrama/new_parser.rb`
+  end
+
+  desc "build parser for debugging"
+  task :racc_verbose_parser do
+    `bundle exec racc parser.y -o lib/lrama/new_parser.rb -t -v`
+  end
+end