Example-macros.md

@@ -8,4 +8,5 @@ Links to some example macros. If you've written a cool macro and want to share p
 * [chained comparisons](https://gist.github.com/4027626)
 * [rudimentary enum](https://gist.github.com/4065056)
 * [y-combinator](https://gist.github.com/4133116)
-* [repo with lots of examples](https://github.com/fabriceleal/SweetJsTests)
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+* [repo with lots of examples](https://github.com/fabriceleal/SweetJsTests)
+* [null checking](https://gist.github.com/4165526)
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