diff --git a/README.md b/README.md
index 032ec72..05e3ed4 100644
--- a/README.md
+++ b/README.md
@@ -25,3 +25,38 @@ navigator.getUserMedia({ video: true, audio: true }, function(stream) {
Look at [index.html](example/index.html) and [main.js](./example/main.js) in the [example](./example) folder to see how to use the result of the stream to display a video on screen when successful, or how to detect errors and showing a message to the user.
Here is a list of [browser support for WebRTC / getUserMedia](http://iswebrtcreadyyet.com/).
+
+## Using the polyfill
+
+Always make sure it's included before anything else that uses `getUserMedia` in your code.
+
+### Option A: include the script
+
+Download and save [the polyfill code](https://raw.githubusercontent.com/mozdevs/mediaDevices-getUserMedia-polyfill/master/mediaDevices-getUserMedia-polyfill.js) and include it in your own code:
+
+```html
+
+ // ... more stuff
+
+
+ // ... maybe more stuff
+
+```
+
+### Option B: use npm
+
+If you prefer to use npm to manage your dependencies:
+
+Install the polyfill:
+
+```bash
+npm install --save md-gum-polyfill
+```
+
+And load it with `require` before using code that uses `getUserMedia`:
+
+```javascript
+require('md-gum-polyfill');
+
+// ... code using getUserMedia...
+```