README.md in vagrant-unbundled-2.3.2.0

- old
+ new

@@ -1,5 +1,11 @@
 # Vagrant Core Plugins
 
 These are plugins that ship with Vagrant. Vagrant core uses its own
 plugin system to power a lot of the core pieces that ship with Vagrant.
 Each plugin will have its own README which explains its specific role.
+
+## Generate proto
+
+```
+grpc_tools_ruby_protoc -I . --ruby_out=gen/plugin --grpc_out=gen/plugin ./plugin_server.proto
+```