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diff --git a/node_modules/get-caller-file/README.md b/node_modules/get-caller-file/README.md
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@@ -2,3 +2,40 @@
 
 [![Build Status](https://travis-ci.org/stefanpenner/get-caller-file.svg?branch=master)](https://travis-ci.org/stefanpenner/get-caller-file)
 [![Build status](https://ci.appveyor.com/api/projects/status/ol2q94g1932cy14a/branch/master?svg=true)](https://ci.appveyor.com/project/embercli/get-caller-file/branch/master)
+
+This is a utility, which allows a function to figure out from which file it was invoked. It does so by inspecting v8's stack trace at the time it is invoked.
+
+Inspired by http://stackoverflow.com/questions/13227489
+
+*note: this relies on Node/V8 specific APIs, as such other runtimes may not work*
+
+## Installation
+
+```bash
+yarn add get-caller-file
+```
+
+## Usage
+
+Given:
+
+```js
+// ./foo.js
+const getCallerFile = require('get-caller-file');
+
+module.exports = function() {
+  return getCallerFile(); // figures out who called it
+};
+```
+
+```js
+// index.js
+const foo = require('./foo');
+
+foo() // => /full/path/to/this/file/index.js
+```
+
+
+## Options:
+
+* `getCallerFile(position = 2)`: where position is stack frame whos fileName we want.