--- a/unicode-display_width.gemspec
+++ b/unicode-display_width.gemspec
@@ -10,7 +10,6 @@
   s.summary     = "Determines the monospace display width of a string in Ruby."
   s.description =  "[Unicode #{Unicode::DisplayWidth::UNICODE_VERSION}] Determines the monospace display width of a string using EastAsianWidth.txt, Unicode general category, and other data."
   s.files = Dir.glob(%w[{lib,data}/**/*])
-  s.extra_rdoc_files = ["README.md", "MIT-LICENSE.txt", "CHANGELOG.md"]
   s.license = 'MIT'
   s.required_ruby_version = '>= 1.9.3'
   s.add_development_dependency 'rspec', '~> 3.4'
