Fix

README.md

@@ -15,7 +15,7 @@ cluster keeps running the roles it needs even as nodes join, leave, or die.
   hardware preferences (disk, longevity, etc.) and policy (`role_policy` in
   `config.json`).
 - **Transport**: nodes talk over a TLS listener (`Listener`/`Whisperer`) and
-  discover each other over UDP (`Discover`). A local control socket
+  discover each other over TCP (`Discover`). A local control socket
   (`ControlSocket`) is how `colonyctl` talks to the node process on the same
   host.
 - **Roles shipped today** (see `role_settings.py`):