diff --git a/kaminari-core/README.md b/kaminari-core/README.md
index 8242ed1..cef37cb 100644
--- a/kaminari-core/README.md
+++ b/kaminari-core/README.md
@@ -1,8 +1,7 @@
 # Kaminari::Core
 
-Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/kaminari/core`. To experiment with that code, run `bin/console` for an interactive prompt.
+Kaminari core libraries.
 
-TODO: Delete this and the text above, and describe your gem
 
 ## Installation
 
@@ -12,30 +11,19 @@ Add this line to your application's Gemfile:
 gem 'kaminari-core'
 ```
 
-And then execute:
+And bundle.
 
-    $ bundle
-
-Or install it yourself as:
-
-    $ gem install kaminari-core
 
 ## Usage
 
-TODO: Write usage instructions here
+This gem is basically an internal gem that will be automatically bundled from kaminari gem.
 
-## 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.
-
-To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
 
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/kaminari-core.
+Pull requests are welcome on GitHub at https://github.com/amatsuda/kaminari.
 
 
 ## License
 
 The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).
-