```ruby
$:.push File.expand_path("../lib", __FILE__)

# Maintain your gem's version:
require "simple_datatable/version"

# Describe your gem and declare its dependencies:
Gem::Specification.new do |s|
  s.name        = "simple_datatable"
  s.version     = SimpleDatatable::VERSION
  s.authors     = ["An Cao"]
  s.email       = ["ancv.it@gmail.com"]
  s.homepage    = "TODO"
  s.summary     = "TODO: Summary of SimpleDatatable."
  s.description = "TODO: Description of SimpleDatatable."
  s.license     = "MIT"

  s.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.rdoc"]
  s.test_files = Dir["test/**/*"]

  s.add_dependency "rails", "~> 4.2.0.rc1"

  s.add_development_dependency "sqlite3"
end
```

Update gemspec file: homepage, summary and description
user
```ruby
$:.push File.expand_path("../lib", __FILE__)

# Maintain your gem's version:
require "simple_datatable/version"

# Describe your gem and declare its dependencies:
Gem::Specification.new do |s|
  s.name        = "simple_datatable"
  s.version     = SimpleDatatable::VERSION
  s.authors     = ["An Cao"]
  s.email       = ["ancv.it@gmail.com"]
  s.homepage    = "https://github.com/Ruby-SG/simple_datatable/"
  s.summary     = "Simple manage admin with datatable"
  s.description = "Add datatable"
  s.license     = "MIT"

  s.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.rdoc"]
  s.test_files = Dir["test/**/*"]

  s.add_dependency "rails", "~> 4.2.0.rc1"

  s.add_development_dependency "sqlite3"
end
```
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