diff --git a/References.md b/References.md
index d60e01e..7954cba 100644
--- a/References.md
+++ b/References.md
@@ -9,5 +9,6 @@
 9. https://corecursive.com/066-sqlite-with-richard-hipp/
 10. https://en.wikipedia.org/wiki/Hurst_exponent 
 11. https://www.johndcook.com/blog/2010/11/29/where-to-wait-for-an-elevator
+12. https://gist.github.com/jboner/2841832