Fix incorrect docs on vendored files & restore docs on generated files

README.md

@@ -43,7 +43,7 @@ special-vendored-path/* linguist-vendored
 jquery.js linguist-vendored=false
 ```
 
-Similar to vendored files, Linguist excludes documentation files from your project's language stats. (Unlike vendored files, documentation files are displayed in diffs on github.com.) [lib/linguist/documentation.yml](lib/linguist/documentation.yml) lists common documentation paths and excludes them from the language statistics for your repository.
+Just like vendored files, Linguist excludes documentation files from your project's language stats. [lib/linguist/documentation.yml](lib/linguist/documentation.yml) lists common documentation paths and excludes them from the language statistics for your repository.
 
 Use the `linguist-documentation` attribute to mark or unmark paths as documentation.
 
@@ -53,6 +53,16 @@ project-docs/* linguist-documentation
 docs/formatter.rb linguist-documentation=false
 ```
 
+#### Generated file detection
+
+Not all plain text files are true source files. Generated files like minified js and compiled CoffeeScript can be detected and excluded from language stats. As an added bonus, unlike vendored and documentation files, these files are suppressed in diffs.
+
+```ruby
+Linguist::FileBlob.new("underscore.min.js").generated? # => true
+```
+
+See [Linguist::Generated#generated?](https://github.com/github/linguist/blob/master/lib/linguist/generated.rb).
+
 ### Using Emacs or Vim modelines
 
 Alternatively, you can use Vim or Emacs style modelines to set the language for a single file. Modelines can be placed anywhere within a file and are respected when determining how to syntax-highlight a file on GitHub.com