diff --git a/README.md b/README.md
index 3a8a562..849939f 100644
--- a/README.md
+++ b/README.md
@@ -6,8 +6,8 @@
 ![The demo](http://i.imgur.com/IYLD8pz.png)
 
 ## Usage
-### console.snapshot( _<canvas>_ )
-`console.snapshot` takes in a `HTMLCanvasElement`, base64 encodes it using `toDataURL` and then outputs it to the canvas using `console.image`.
+### console.snapshot( _<canvas>_ [, _<scale>_ ] )
+`console.snapshot` takes in a `HTMLCanvasElement`, base64 encodes it using `toDataURL` and then outputs it to the canvas using `console.image`. You can also pass along an optional scale factor to scale down the outputted image for better viewing within the Dev tools.
 
 ```js
 var canvas = document.createElement("canvas"),
@@ -18,6 +18,7 @@ var canvas = document.createElement("canvas"),
 	// ...
 
 console.snapshot(canvas);
+console.snapshot(canvas, 0.8); //Snapshot it and scale the output to 80% of the original size
 ```
 
 ### console.image( _<url>_ )
@@ -27,4 +28,8 @@ console.snapshot(canvas);
 console.image("http://i.imgur.com/wWPQK.gif");
 ```
 
+## Troubleshooting
+#### I'm getting "Uncaught Error: SecurityError: DOM Exception 18" when I try to snapshot the canvas
+This is what happens when you print non CORS enabled image on the canvas. The browser blocks the `toDataURL` function which is what `console.image` depends on print the canvas. To fix this, see [this tutorial on HTML5Rocks](http://www.html5rocks.com/en/tutorials/cors/) or consider passing your image through a CORS proxy such as [corsproxy.com](http://corsproxy.com).
+
 License: MIT
\ No newline at end of file