diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 000000000..a35001a93
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,80 @@
+inherit_from:
+  - ../.rubocop.yml
+
+Bundler/GemFilename:
+  Enabled: false
+
+Homebrew/MoveToExtendOS:
+  Enabled: true
+  Exclude:
+    - "{extend,test,requirements}/**/*"
+    - "os.rb"
+
+Naming/PredicateName:
+  inherit_mode:
+    merge:
+      - AllowedMethods
+  AllowedMethods:
+    - is_32_bit?
+    - is_64_bit?
+
+# Only enforce documentation for public APIs.
+# Checked by the tests.yml syntax job
+Style/Documentation:
+  AllowedConstants:
+    - Homebrew
+  Include:
+    - cask/cask.rb
+    - cask/dsl.rb
+    - cask/dsl/version.rb
+    - cask/url.rb
+    - development_tools.rb
+    - download_strategy.rb
+    - extend/ENV/super.rb
+    - extend/kernel.rb
+    - extend/pathname.rb
+    - formula.rb
+    - formula_assertions.rb
+    - formula_free_port.rb
+    - language/go.rb
+    - language/java.rb
+    - language/node.rb
+    - language/perl.rb
+    - language/python.rb
+    - livecheck/strategy/apache.rb
+    - livecheck/strategy/bitbucket.rb
+    - livecheck/strategy/cpan.rb
+    - livecheck/strategy/crate.rb
+    - livecheck/strategy/extract_plist.rb
+    - livecheck/strategy/git.rb
+    - livecheck/strategy/github_latest.rb
+    - livecheck/strategy/github_releases.rb
+    - livecheck/strategy/gnome.rb
+    - livecheck/strategy/gnu.rb
+    - livecheck/strategy/hackage.rb
+    - livecheck/strategy/json.rb
+    - livecheck/strategy/launchpad.rb
+    - livecheck/strategy/npm.rb
+    - livecheck/strategy/page_match.rb
+    - livecheck/strategy/pypi.rb
+    - livecheck/strategy/sourceforge.rb
+    - livecheck/strategy/sparkle.rb
+    - livecheck/strategy/xml.rb
+    - livecheck/strategy/xorg.rb
+    - livecheck/strategy/yaml.rb
+    - os.rb
+    - resource.rb
+    - utils/inreplace.rb
+    - utils/shebang.rb
+    - utils/string_inreplace_extension.rb
+    - version.rb
+    - tap.rb
+
+Homebrew/NegateInclude:
+  Exclude:
+    # YARD runs stand-alone.
+    - yard/docstring_parser.rb
+
+Style/DocumentationMethod:
+  Include:
+    - "formula.rb"