diff --git a/README.md b/README.md
index 970aeda4..09db40a5 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,8 @@ The Acknowledgements
This project was inspired in part by the ["NSA-proof your email in 2 hours"](http://sealedabstract.com/code/nsa-proof-your-e-mail-in-2-hours/) blog post by Drew Crawford, [Sovereign](https://github.com/al3x/sovereign) by Alex Payne, and conversations with @shevski, @konklone, and @GregElin.
+Mail-in-a-Box is similar to [iRedMail](http://www.iredmail.org/).
+
The History
-----------