diff --git a/README.md b/README.md
index 99b3549..9c0cc59 100644
--- a/README.md
+++ b/README.md
@@ -22,4 +22,8 @@ Ze Github's.
 * SOCKS4
 * SOCKS5
   * [Mar. 1996](http://tools.ietf.org/html/rfc1928)
-  * [User/Pass Authentication](http://tools.ietf.org/html/rfc1929)
\ No newline at end of file
+  * [User/Pass Authentication](http://tools.ietf.org/html/rfc1929)
+  
+## Previous Art
+* [ximapd](https://github.com/shugo/ximapd)
+* [mailcatcher](https://github.com/sj26/mailcatcher)
\ No newline at end of file