diff --git a/README.md b/README.md
index 387fd29..06c64bf 100644
--- a/README.md
+++ b/README.md
@@ -383,7 +383,7 @@ For greatest security, you want to run Docker inside a virtual machine.  This is
 
 Docker image ids are [sensitive information](https://medium.com/@quayio/your-docker-image-ids-are-secrets-and-its-time-you-treated-them-that-way-f55e9f14c1a4) and should not be exposed to the outside world.  Treat them like passwords.
 
-See the [Docker Security Cheat Sheet](https://github.com/konstruktoid/Docker/blob/master/Security/CheatSheet.md) by [Thomas Sjögren](https://github.com/konstruktoid): some good stuff about container hardening in there.
+See the [Docker Security Cheat Sheet](https://github.com/konstruktoid/Docker/blob/master/Security/CheatSheet.adoc) by [Thomas Sjögren](https://github.com/konstruktoid): some good stuff about container hardening in there.
 
 Check out the [docker bench security script](https://github.com/docker/docker-bench-security), download the [white papers](https://blog.docker.com/2015/05/understanding-docker-security-and-best-practices/) and subscribe to the [mailing lists](https://www.docker.com/docker-security) (unfortunately Docker does not have a unique mailing list, only dev / user).