Update README.md

README.md

@@ -4,3 +4,11 @@ Just open the html file in a html5 compatible browser with javascript enabled.
 You are allowed to do whatever you want with this code, except:
 - You may not take this software without modifications, and claim it as your own.
 - Any modifications made by you must be shared on request, as long as your project is active.
+
+### Acknowledgements
+I have never done anything in HTML5 and canvas, and JavaScript was years and years ago, until I started this.
+Thank you, Mark Erickson, for your code example. I learned a lot from it.
+
+https://stackoverflow.com/questions/23451267/how-to-make-drawing-draggable-on-canvas-in-html5
+
+http://jsfiddle.net/m1erickson/ytUhL/