diff --git a/README.md b/README.md
index c9f560c..fd54be0 100644
--- a/README.md
+++ b/README.md
@@ -182,6 +182,9 @@ A curated list of awesome malware analysis tools and resources. Inspired by
   malware repository.
 * [Cuckoo Sandbox](http://cuckoosandbox.org/) - Open source, self hosted
   sandbox and automated analysis system.
+* [cuckoo-modified](https://github.com/brad-accuvant/cuckoo-modified) - Modified version
+  of Cuckoo Sandbox released under the GPL. Not merged upstream due to legal
+  concerns by the author.
 * [DRAKVUF](https://github.com/tklengyel/drakvuf) - Dynamic malware analysis
   system.
 * [Hybrid Analysis](https://www.hybrid-analysis.com/) - Online malware