Update README.md

Author: briangonzalez

README.md

@@ -62,7 +62,7 @@ $('img.my-image').on('ab-color-found', function(payload){
 
 Caveats
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-This plugin utlizes the `<canvas>` element and the `ImageData` object, and due to cross-site security limitations, the script will silently fail if one tries to extract the colors from an image not hosted on the current domain. This plugin is built on top of a script called [RGBaster](https://github.com/briangonzalez/rgbaster.js). 
+This plugin utlizes the `<canvas>` element and the `ImageData` object, and due to cross-site security limitations, the script will fail if one tries to extract the colors from an image not hosted on the current domain, *unless* the image allows for [Cross Origin Resource Sharing](http://en.wikipedia.org/wiki/Cross-origin_resource_sharing). This plugin is built on top of a script called [RGBaster](https://github.com/briangonzalez/rgbaster.js). 
 
 Author
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