Update README.md

Author: julienschmidt

README.md

@@ -30,7 +30,7 @@ A MySQL-Driver for Go's [database/sql](http://golang.org/pkg/database/sql) packa
 ## Features
   * Lightweight and [fast](https://github.com/go-sql-driver/sql-benchmark "golang MySQL-Driver performance")
   * Native Go implementation. No C-bindings, just pure Go
-  * Connections over TCP/IPv4, TCP/IPv6 or Unix domain sockets
+  * Connections over TCP/IPv4, TCP/IPv6, Unix domain sockets or [custom protocols](http://godoc.org/github.com/go-sql-driver/mysql#DialFunc)
   * Automatic handling of broken connections
   * Automatic Connection Pooling *(by database/sql package)*
   * Supports queries larger than 16MB