diff --git a/readme.md b/readme.md
index dc4c88d..30b9c9f 100644
--- a/readme.md
+++ b/readme.md
@@ -28,6 +28,8 @@ console.log(foo.contents);
 
 ## API
 
+Extends the [Vinyl API](https://github.com/gulpjs/vinyl-fs#api) with the following:
+
 ### new File(options, contents)
 
 - `options` `{String|Object}` - Path or options.