diff --git a/README.md b/README.md
index e61ef0a..c30ffdb 100644
--- a/README.md
+++ b/README.md
@@ -177,6 +177,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [LibTomCrypt](https://github.com/libtom/libtomcrypt) - A fairly comprehensive, modular and portable cryptographic toolkit. [WTFPL]
 * [Nettle](http://www.lysator.liu.se/~nisse/nettle/) - A low-level cryptographic library. [LGPL]
 * [OpenSSL](http://www.openssl.org/) - A robust, commercial-grade, full-featured, and Open Source cryptography library. [Apache]
+* [retter](https://github.com/MaciejCzyzewski/retter) - A collection of hash functions, ciphers, tools, libraries, and materials related to cryptography.
 * [Tiny AES128 in C](https://github.com/kokke/tiny-AES128-C) - A small and portable implementation of the AES128 ECB encryption algorithm implemented in C. [PublicDomain]
 
 ## Database