diff --git a/README.md b/README.md
index f368997f5f..bc994d7cf6 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,8 @@ your config/application.rb to apply RuboCop autocorrection to code generated by
 module YourCoolApp
   class Application < Rails::Application
     config.generators.after_generate do |files|
-      system("bundle exec rubocop -A --fail-level=E #{files.shelljoin}", exception: true)
+      parsable_files = files.filter { |file| file.end_with?('.rb') }
+      system("bundle exec rubocop -A --fail-level=E #{parsable_files.shelljoin}", exception: true)
     end
   end
 end
diff --git a/docs/modules/ROOT/pages/usage.adoc b/docs/modules/ROOT/pages/usage.adoc
index beda1a7ebc..c2bff0e9f4 100644
--- a/docs/modules/ROOT/pages/usage.adoc
+++ b/docs/modules/ROOT/pages/usage.adoc
@@ -41,7 +41,8 @@ your config/application.rb to apply RuboCop autocorretion to code generated by `
 module YourCoolApp
   class Application < Rails::Application
     config.generators.after_generate do |files|
-      system("bundle exec rubocop -A --fail-level=E #{files.shelljoin}", exception: true)
+      parsable_files = files.filter { |file| file.end_with?('.rb') }
+      system("bundle exec rubocop -A --fail-level=E #{parsable_files.shelljoin}", exception: true)
     end
   end
 end